Mishnayos Avos Perek 3 Mishnah 15

"Everything is foreseen": Everything that a man does in the innermost rooms is revealed in front of Him.

"and freewill is given": into the hand of man to do good and evil, as it is written (Deuteronomy 30:15), : "See, I have given in front of you today life, etc."

"and with goodness the world is judged": with the attribute of mercy. And nonetheless, not everyone is equal in this trait, since, "all is in accordance to the majority of the deed:" One who does many good deeds is given much mercy, and one who does few good deeds is given a little mercy. A different explanation: "all is in accordance to the majority of the deed" - according to the majority of a person's deeds is he judged, if the majority are merits, he is exonerated; if the majority are sins, he is liable. And Rambam explained, "Everything is foreseen": Every action of people - that which he has done and that which he will do in the future - is revealed in front of Him. And do not say, "Since the Holy One, blessed be He, knows what a person will do - if so, he is compelled in his actions to be righteous or evil." As "freewill is given" into his hand to do good and evil and there is nothing there that compels him at all. And since this is so, "with goodness (or properly) the world is judged," to collect [punishment] from the evildoers and to give a good reward to the righteous ones. As since the sinner sinned willingly, it is fitting that he be punished; and since the righteous one was willingly righteous, it is fitting that he receive a reward.

"all is in accordance to the majority of the deed": According to what a person repeats and is constant in the doing of good, his reward will be multiplied. As one who distributes a hundred gold coins to charity [giving out one coin at a time] is not similar to one who gives them out [all] at one time. And the textual variant of Rambam is, "all is in accordance to the majority of the deed"; and not "as per the deed."