(1) Shammai says, "Make your Torah fixed": As they said in The Fathers According to Rabbi Nathan 28:10, "Anyone who makes his Torah [study] primary and his work secondary is made primary in the world to come. And anyone that makes his Torah [study] secondary and his work primary will be made secondary in the world to come. This means to say, even though he did not do a sin, but he did not make Torah primary - even if he was (fit) to be in the Garden of Eden, he will be secondary there.
(2) "say little and do much": When you promise your friend to do something for him, tell him a little and do much for him, and that is in the way of ethics and piety. And we have learned [it] from our father Avraham, peace be upon him, as it is written (Genesis 18:5), "And let me fetch a morsel of bread"; and afterwards (Genesis 18:8), "And he took curds and milk and the calf, etc." Another explanation: "say little and do much" - and that is a lofty virtue. And our rabbis, may their memory be blessed, learned it from the blessed Holy One, blessed be He, who only promised with two letters, as it is stated (Genesis 15:14), "I will judge (dan, a word which is written with only two letters); and delivered them with twenty seven words, as it is stated (Deuteronomy 30:14), "Or has any god ventured to go and take for himself one nation from the midst of another, etc." And about this Rabbi Saadia Gaon, my his memory be blessed, said, "If in promising our fathers with two letters, he did for them many miracles and wonders; [with] the salvation in the future to come about which have been written many pages and many manuscripts and many books of promises and many consolations in Jeremiah in the Prophets, how much the more so will it be that His actions will be more wondrous than that which He promised - 'our soul knows this well.' And a person should know and consider the matter and to put into his heart that there will be a great reward for him because of the promises" (HaEmunot veHaDeot 8:1).
(3) "and receive every person with a pleasant countenance": That he show them a happy face, so that 'the spirit of creations find pleasure from him.' Another explanation: "and receive" - that he should distance himself from the trait of anger which is a very bad trait and conduct himself with the trait of good will, in such a way that people will be satisfied with him. [This is] proper and well-accepted. About this our sages, may their memory be blessed, said in the way of ethical teachings, "Do you want to be liked? Like that which you don't like." As a person cannot accomplish that the people of the world will like him if he does not forego his traits. And if he does not forego his wants for the sake of their wants, he must negate his will for the sake of the will of others. And with this, he will have many friends and guard himself from the injuries of people. As they will hate and seek to hurt one who shows them an angry face.