Pedro Calderón de la Barca,
Life Is a Dream
“ And, by the bye, for one test, Segismund, Between such swearable realities— Since Dreaming, Madness, Passion, are akin In missing each that salutary rein Of reason, and the guiding will of man: One test, I think, of waking sanity Shall be that conscious power of self-control, To curb all passion, but much most of all That evil and vindictive, that ill squares With human, and with holy canon less, Which bids us pardon ev'n our enemies, And much more those who, out of no ill will, Mistakenly have taken up the rod Which heaven, they think, has put into their hands. ”

