“Rarely will you meet anyone so jealous as a teacher. Year after year students tumble along like the waters of a river. They flow away, and only the teacher is left behind, like some deeply buried rock at the bottom of the current. Although he may tell others of his hopes, he doesn't dream of them himself. He thinks of himself as worthless and either falls into masochistic loneliness or, failing that, ultimately becomes suspicious and pious, forever denouncing the eccentricities of others. He longs so much for freedom and action that he can only hate people.”

Variant translations:
Above all, do not lie to yourself. A man who lies to himself and listens to his own lie comes to a point where he does not discern any truth either in himself or anywhere around him, and thus falls into disrespect towards himself and others. Not respecting anyone, he ceases to love, and having no love, he gives himself up to passions and coarse pleasures, in order to occupy and amuse himself, and in his vices reaches complete bestiality, and it all comes from lying continually to others and to himself. A man who lies to himself is often the first to take offense. It sometimes feels very good to take offense, doesn't it? And surely he knows that no one has offended him, and that he himself has invented the offense and told lies just for the beauty of it, that he has exaggerated for the sake of effect, that he has picked on a word and made a mountain out of a pea — he knows all of that, and still he is the first to take offense, he likes feeling offended, it gives him great pleasure, and thus he reaches the point of real hostility… Do get up from your knees and sit down, I beg you, these posturings are false, too.
Part I, Book I: A Nice Little Family, Ch. 2 : The Old Buffoon; as translated by Richard Pevear and Larissa Volokhonsky, p. 44
The Brothers Karamazov (1879–1880)

Source: The Reappearance of the Christ (1948), Chapter III: The Reappearance of the Christ, World Expectancy, p. 62

Pedagogia do oprimido (Pedagogy of the Oppressed) (1968, English trans. 1970)

In "Tale of the Three Storytelling Machines of King Genius", §3
The Cyberiad (1967)

Martí : Thoughts/Pensamientos (1994)

§ IV
1910s, At the Feet of the Master (1911)
Context: These three great crimes you must avoid, for they are fatal to all progress, because they sin against love. But not only must you thus refrain from evil; you must be active in doing good. You must be so filled with the intense desire of service that you are ever on the watch to render it to all around you — not to man alone, but even to animals and plants. You must render it in small things every day, that the habit may be formed, so that you may not miss the rare opportunity when the great thing offers itself to be done. For if you yearn to be one with God, it is not for your own sake; it is that you may be a channel through which His love may flow to reach your fellow-men.
He who is on the Path exists not for himself, but for others; he has forgotten himself, in order that he may serve them. He is as a pen in the hand of God, through which His thought may flow, and find for itself an expression down here, which without a pen it could not have. Yet at the same time he is also a living plume of fire, raying out upon the world the Divine Love which fills his heart.
The wisdom which enables you to help, the will which directs the wisdom, the love which inspires the will — these are your qualifications. Will, Wisdom and Love are the three aspects of the Logos; and you, who wish to enroll yourselves to serve Him, must show forth these aspects in the world.

Persecution and Tolerance, Hulsean Lectures, University of Cambridge (Winter 1893–94)

Vol. I, Ch. 10, Section 5, pg. 296.
(Buch I) (1867)