“Great tragedies have great consequences. They ripple through the fabric of this world and the next. When the loss is too great for either world to bear, Everlost absorbs the shock, like a cushion between the two.”

1960s, Keep Moving From This Mountain (1965)
Context: Each of us lives in two realms, the "within" and the "without." The within of our lives is somehow found in the realm of ends, the without in the realm of means. The within of our [lives], the bottom — that realm of spiritual ends expressed in art, literature, morals, and religion for which at best we live. The without of our lives is that realm of instrumentalities, techniques, mechanisms by which we live. Now the great temptation of life and the great tragedy of life is that so often we allow the without of our lives to absorb the within of our lives. The great tragedy of life is that too often we allow the means by which we live to outdistance the ends for which we live.

Widely attributed since the mid to late 19th century, this apparently derives from a gloss or commentary on the following passage from Aristotle's Nicomachean Ethics (c. 325 BC), Book 1, Ch. XI (Bekker No. 1100b.13–14):
ὅμως δὲ καὶ ἐν τούτοις διαλάμπει τὸ καλόν, ἐπειδὰν φέρῃ τις εὐκόλως πολλὰς καὶ μεγάλας ἀτυχίας, μὴ δι᾽ ἀναλγησίαν, ἀλλὰ γεννάδας ὢν καὶ μεγαλόψυχος. εἰ δ᾽ εἰσὶν αἱ ἐνέργειαι κύριαι τῆς ζωῆς, καθάπερ εἴπομεν, οὐδεὶς ἂν γένοιτο τῶν μακαρίων ἄθλιος
But nevertheless, even in these [misfortunes], nobility of the soul is conspicuous, when a man bears and digests many and great misfortunes, not from insensibility, but because he is high spirited and magnanimous. But if the energies are the things that constitute the bliss or the misery of life, as we said, no happy man can ever become miserable.
A New Translation of the Nicomachean Ethics of Aristotle (1835), 3rd. ed., Oxford: J. Vincent. p. 30
Nevertheless even under these [misfortunes] the force of nobility shines out, when a man bears calmly many great disasters, not from insensibility, but because he is generous and of a great soul. Setting happiness then, as we do, not in the outward surroundings of man, but in his inward state, we may fairly say that no one who has attained to the bliss of virtue will ever justly become an object of pity or contempt.
St. George William Joseph Stock, Lectures in the Lyceum or Aristotle's ethics for English readers (1897), p. 47
Misattributed

Dalai Lama honours Tintin and Tutu, BBC (Friday, 2 June 2006) http://news.bbc.co.uk/2/hi/europe/5040198.stm

Mathematical Methods in Science (1977), p.215

Source: Life is a Miracle: An Essay Against Modern Superstition

Source: A Testament of Hope: The Essential Writings and Speeches

The Autocrat of the Breakfast Table (1858)

Source: The Greek Way (1930), Ch. 1