Rav Kook said
"Therefore, the pure righteous do not complain of the dark, but increase the light; they do not complain of evil, but increase justice; they do not complain of heresy, but increase faith; they do not complain of ignorance, but increase wisdom."
Ben Zoma said
“Who is wise? The one who learns from all people…
“Who is mighty? The one who subdues the evil inclination…
“Who is rich? The who who rejoices in his portion….
“Who is honored? The one who honors other human beings….”
Hillel used to say
”If I am not for myself, who will be for me?
And if I am only for myself, what am I?
And if not now, when?”
“This, too, will be for the best.” Nachum of Gamzu
"If a rock, though extremely hard, can be hollowed out by water, how much more so should it be possible for The Light, which is compared to water, to change my heart. I will begin to study it, and try to become a scholar of The Light." Rabbi Akiva
When a person, by means of his studies, reaches the level at which he wants nothing but spiritual elevation and at which he accepts only the bare necessities of life in order to sustain his physical existence, not for pleasure’s sake, this is the first step of his ascent to the spiritual world.