“Smoking has a sedative effect upon the nerves, and enables a man to bear the sorrows of this life (of which every one has his share) not only decently, but dignifiedly.”

Apostolic Letter, Salvifici Doloris (“redemptive suffering”), 1984
Source: http://w2.vatican.va/content/john-paul-ii/en/apost_letters/1984/documents/hf_jp-ii_apl_11021984_salvifici-doloris.html

Variant: I think the idea is that every person has to live for his or her own life and then make the choice to share it with other people.
Source: The Perks of Being a Wallflower

Part 1, Chapter 11 (page 35)
Notes from Underground (1864)
Context: Every man has some reminiscences which he would not tell to everyone, but only to his friends. He has others which he would not reveal even to his friends, but only to himself, and that in secret. But finally there are still others which a man is even afraid to tell himself, and every decent man has a considerable number of such things stored away. That is, one can even say that the more decent he is, the greater the number of such things in his mind.

Source: Uncle Tom's Cabin

Orontes (Handing over Xeones' corpse to Athenian civilians) p. 430
Gates of Fire (1998)

1900s, Letter to Winfield T. Durbin (1903)

Source: The administrative theory in the state, 1923, p. 102 cited in: Göran Svensson, Greg Wood, (2006) "Sustainable components of leadership effectiveness in organizational performance", Journal of Management Development, Vol. 25 Iss: 6, pp.522 - 534

Context: It has an unhappy effect upon the human understanding and temper, for a man to be compelled in his gravest investigation of an argument, to consider, not what is true, but what is convenient. The lawyer never yet existed who has not boldly urged an objection which he knew to be fallacious, or endeavoured to pass off a weak reason for a strong one. Intellect is the greatest and most sacred of all endowments; and no man ever trifled with it, defending an action to-day which he had arraigned yesterday, or extenuating an offence on one occasion, which, soon after, he painted in the most atrocious colours, with absolute impunity. Above all, the poet, whose judgment should be clear, whose feelings should be uniform and sound, whose sense should be alive to every impression and hardened to none, who is the legislator of generations and the moral instructor of the world, ought never to have been a practising lawyer, or ought speedily to have quitted so dangerous an engagement.

The Life of Geoffrey Chaucer vol. 1, p. 370 (1803)