תשובה ברמב"ם

(1) [Who has reached] complete Teshuvah? A person who confronts the same situation in which he sinned when he has the potential to commit [the sin again], and, nevertheless, abstains and does not commit it because of his Teshuvah alone and not because of fear or a lack of strength.
For example, a person engaged in illicit sexual relations with a woman. Afterwards, they met in privacy, in the same country, while his love for her and physical power still persisted, and nevertheless, he abstained and did not transgress. This is a complete Baal-Teshuvah. This was implied by King Solomon in his statement [Ecclesiastes 12:1] "Remember your Creator in the days of your youth, [before the bad days come and the years draw near when you will say: `I have no desire for them.'"]
If he does not repent until his old age, at a time when he is incapable of doing what he did before, even though this is not a high level of repentance, he is a Baal-Teshuvah...

(2) What constitutes Teshuvah? That a sinner should abandon his sins and remove them from his thoughts, resolving in his heart, never to commit them again as [Isaiah 55:7] states "May the wicked abandon his ways...." Similarly, he must regret the past as [Jeremiah 31:18] states: "After I returned, I regretted."
[He must reach the level where] He who knows the hidden will testify concerning him that he will never return to this sin again as [Hoshea 14:4] states: "We will no longer say to the work of our hands: `You are our gods.'"
He must verbally confess and state these matters which he resolved in his heart.

(4) Among the paths of repentance is for the penitent to a) constantly call out before God, crying and entreating; b) to perform charity according to his potential; c) to separate himself far from the object of his sin; d) to change his name, as if to say "I am a different person and not the same one who sinned;" e) to change his behavior in its entirety to the good and the path of righteousness; and f) to travel in exile from his home. Exile atones for sin because it causes a person to be submissive, humble, and meek of spirit.

(1) If a person transgresses any of the mitzvot of the Torah, whether a positive command or a negative command - whether willingly or inadvertently - when he repents, and returns from his sin, he must confess before God, blessed be He, as [Numbers 5:6-7] states: "If a man or a woman commit any of the sins of man... they must confess the sin that they committed."
This refers to a verbal confession. This confession is a positive command.
How does one confess: He states: "I implore You, God, I sinned, I transgressed, I committed iniquity before You by doing the following. Behold, I regret and am embarrassed for my deeds. I promise never to repeat this act again."
These are the essential elements of the confessional prayer. Whoever confesses profusely and elaborates on these matters is worthy of praise.

(1) And that is that He commanded us to confess the transgressions and sins that we have done before God and to say them together with [our] repentance. And that is confession. And its intent is that one say, "Please, Lord, I have sinned, I have transgressed, I have rebelled and I have done such and such." And he should prolong the statement and request forgiveness about this matter according to the polish of his speech. ... Behold that which we have mentioned has been made clear to you - that confession is a separate obligation; and that it is an obligation for the sinner for every sin that he did. Whether in the Land or outside of the Land; whether he brought a sacrifice or did not bring a sacrifice - he is obligated to confess, as it is stated, "And they shall confess for their iniquities." And the language of the [Sifra] is, "'And he shall confess' - that is confession of words...

(3) Anyone who verbalizes his confession without resolving in his heart to abandon [sin] can be compared to [a person] who immerses himself [in a mikvah] while [holding the carcass of] a lizard in his hand. His immersion will not be of avail until he casts away the carcass.
This principle is implied by the statement, [Proverbs 28:13], "He who confesses and forsakes [his sins] will be treated with mercy."
It is necessary to mention particularly one's sins as evidenced by [Moses' confession, Exodus 32:31]: "I appeal to You. The people have committed a terrible sin by making a golden idol."

(3) A person should not think that repentance is only necessary for those sins that involve deed such as promiscuity, robbery, or theft. Rather, just as a person is obligated to repent from these, similarly, he must search after the evil character traits he has. He must repent from anger, hatred, envy, frivolity, the pursuit of money and honor, the pursuit of gluttony, and the like. He must repent for all [of the above].
These sins are more difficult than those that involve deed. If a person is attached to these, it is more difficult for him to separate himself. In this context, [Isaiah 55:7] exhorts: "May the wicked abandon his path and the crooked man, his designs."

(1) The foundation of all foundations and the pillar of wisdom is to know that there is a Primary Being who brought into being all existence. All the beings of the heavens, the earth, and what is between them came into existence only from the truth of His being.

(2) ...virtues are either intellectual or moral. Similarly, vices are intellectual, as ignorance, stupidity, and want of understanding; or they are moral as inordinate lust, pride, irascibility, anger, impudence, avarice, and many other similar defects, a list of which we have given and explained in Chapter IV. Each of these defects is as a partition separating man from God, the Most High. This is what the prophet meant when he said, “But your iniquities have ever made a separation between you and your God”. which means that our sins—which, as we have said, are the evil qualities—are the partitions which separate us from God.

(1) PROPHECY is... and moral perfection produced by the suppression of every thought of bodily pleasures, and of every kind of foolish or evil ambition...

(1) ...those who are morally ill desire and love bad traits, hate the good path, and are lazy to follow it. Depending on how sick they are, they find it exceedingly burdensome.
Isaiah 5:20 speaks of such people in a like manner: "Woe to those who call the bad good, and the good bad, who take darkness to be light and light to be darkness, who take bitter to be sweet and sweet to be bitter." Concerning them, Proverbs 2:13 states: "Those who leave the upright paths to walk in the ways of darkness."

(1) Since maintaining a healthy and sound body is among the ways of God - for one cannot understand or have any knowledge of the Creator, if he is ill - therefore, he must avoid that which harms the body and accustom himself to that which is healthful and helps the body become stronger.

And let us pray to God and beseech Him that He clear and remove from our way everything that forms an obstruction and a partition between us and Him, although most of these obstacles are our own creation, as has several times been shown in this treatise. Comp. “Your iniquities have separated between you and your God” (Isa. 59:2).