Tetzaveh - Speaking From the Heart

THOU SHALT NOT HATE THY BROTHER IN THY HEART. Because it is the way of those who hate a person to cover up their hatred in their hearts, just as it is said, He that hateth dissembleth with his lips, but he layeth up deceit within him, therefore Scripture speaks of the usual events, [mentioning, thou shalt not hate thy brother ‘in thy heart,’ but the law forbids all hating, even if done openly]. THOU SHALT SURELY REBUKE THY NEIGHBOR, This constitutes another commandment, that we must teach him reproof of instruction. THOU SHALT NOT BEAR SIN BECAUSE OF HIM, for you will bear sin because of his transgression if you do not rebuke him. Onkelos’ rendition tends towards this explanation, for he translated, “and do not receive guilt because of him,” meaning that you should not be punished by his sin. Following these commandments He then said [in the following verse] that you are to love your neighbor. Thus he who hates his neighbor violates a negative commandment, and he who loves him, fulfills a positive commandment.
The correct interpretation appears to me to be that the expression ‘hochei’ach tochiach’ (thou shalt surely rebuke), is similar to ‘V’hochiach Avraham’ (And Abraham reproved) Abimelech. The verse here is thus stating: “do not hate your brother in your heart when he does something to you against your will, but instead you are to reprove him, saying, ‘Why did you do thus to me?’ and you will not bear sin because of him by covering up your hatred of him in your heart and not telling him, for when you will reprove him, he will justify himself before you [so that you will have no cause to hate him], or he will regret his action and admit his sin, and you will forgive him.” After that He admonishes [in the following verse] that you are not to take vengeance of him, nor bear a grudge in your heart against him because of what he has done to you, for it is possible that he will not hate him, but yet he will remember in his heart his neighbor’s sin against him; therefore He admonished him that he is to erase his brother’s sin and transgression against him from his heart. Following that admonition, He commanded that he love him as himself.

Proper intention: What is implied?
Any prayer that is not [recited] with proper intention is not prayer. If one prays without proper intention, he must repeat his prayers with proper intention.
One who is in a confused or troubled state may not pray until he composes himself. Therefore, one who comes in from a journey and is tired or irritated is forbidden to pray until he composes himself. Our Sages taught that one should wait three days until he is rested and his mind is settled, and then he may pray.

That One Must Direct One's Intention For All The Blessings and That One Can Pray In Any Language, containing 4 s'ifim.
One who prays [the Amidah] needs to direct one's intention for all the blessings, but if one is not able to direct one's intention during all of them, one should at least concentrate on the blessing of the forefathers [the first blessing of the Amidah]. If one didn't direct one's intention while saying the blessing of the forefathers, even if one directed one's intention for the rest [of the blessings], one needs to return [to the beginning of the Amidah] and pray. Gloss: (Nowadays we do not return [to repeat the prayer when it is] due to a lack of intention, because [there's a fair chance that] even in the repeating [of the Amidah] it is likely that one will not direct one's intention [again]; if so, why should one return?) (Tur)

A person who prayed without concentrating [on his prayers] must pray a second time with concentration. However, if he had concentrated during the first blessing, nothing more is necessary.
A person who errs in the recitation of the first three blessings [of the Shemoneh Esreh] must return to the beginning [of the Shemoneh Esreh]. Should one err in the recitation of the final three blessings, one should return to [the blessing, R'tzey]. If one errs in the midst of [one of] the intermediate blessings, one should return to the beginning of that blessing and [then] conclude one's prayers in the [proper] order.
Should the leader of the congregation err when he is praying out loud, he should [correct himself] based on these principles.