“Had it not been for you, I should have remained what I was when we first met, a prejudiced, narrow-minded being, with contracted sympathies and false knowledge, wasting my life on obsolete trifles, and utterly insensible to the privilege of living in this wondrous age of change and progress.”

The Great Approach (2001)

Source: 1946 - 1963, In conversation with Dora Vallier' (1954), p. 265

Speech to the United Negro College Fund (9 May 1989), mangling the Fund's slogan "A mind is a terrible thing to waste."

The Razor's Edge (1984)

The monster to Robert Walton
Frankenstein (1818)
Context: I seek not a fellow feeling in my misery. No sympathy may I ever find. When I first sought it, it was the love of virtue, the feelings of happiness and affection with which my whole being overflowed, that I wished to be participated. But now that virtue has become to me a shadow, and that happiness and affection are turned into bitter and loathing despair, in what should I seek for sympathy? I am content to suffer alone while my sufferings shall endure; when I die, I am well satisfied that abhorrence and opprobrium should load my memory. Once my fancy was soothed with dreams of virtue, of fame, and of enjoyment. Once I falsely hoped to meet with beings who, pardoning my outward form, would love me for the excellent qualities which I was capable of unfolding. I was nourished with high thoughts of honour and devotion. But now crime has degraded me beneath the meanest animal. No guilt, no mischief, no malignity, no misery, can be found comparable to mine. When I run over the frightful catalogue of my sins, I cannot believe that I am the same creature whose thoughts were once filled with sublime and transcendent visions of the beauty and the majesty of goodness. But it is even so; the fallen angel becomes a malignant devil. Yet even that enemy of God and man had friends and associates in his desolation; I am alone.

Variant: Idle youth, enslaved to everything; by being too sensitive I have wasted my life.
Source: Selected Poems and Letters

Source: La Vita Nuova (1293), Chapter I, opening lines (as reported in The 100 Best Love Poems of All Time by Leslie Pockell)