Tosefta sobre Ezequiel 33:12

One who does 1 mitzvah, it causes good for him, it lengthens his days and his years and he inherits the soil. Anyone who does one averah, it causes bad for him, it plucks off his days and he does not inherit the land. About this one it is said, "One sinner can destroy much good" (Kohelet 9:18)—with a single sin, this one destroyed for him many good things. A person should always see himself as if he is half innocent and half guilty. If he does one mitzvah, he is happy that he tipped his scale to the side of innocence. If he does one averah, woe to him! he tipped his scale to the side of guilt. About this one it is said, "One sinner can destroy much good"—with a single sin, this one destroyed for him many good things. Rabbi Shimon ben Elazar says in the name of Rabbi Meir: Because an individual is judged according to the majority [of his deeds] and the world is judged according to the majority [of the deeds performed in it], one who does one mitzvah is happy that he has tipped his scales and the scales of the world to the side of innocence; if he does one averah, woe to him! he tips his scale and the scale of the world to the side of guilt. About this one it is said, "One sinner can destroy much good"—with a single sin, this one destroyed for him many good things. Rabbi Shimon says: If someone was righteous their entire life, but in the end rebelled, he lost everything, as it is said, "The righteousness of the righteous will not save him on the day of his wickedness" (Yehezkel 33:12). If someone were wicked all their life and did teshuvah at the end, God receives him, as it is said, "He will not trip on the wickedness of the wicked on the day he returns from his wickedness" (Yehezkel 33:12). Anyone who is engaged in all three of them—in Scripture, Mishnah and an occupation—about this person it is said, "The threefold cord will not be quickly broken" (Kohelet 4:12).