“If my life is of no value to my friends it is of none to myself.”

Letter http://teachingamericanhistory.org/library/index.asp?document=296 to Gilbert du Motier, marquis de Lafayette (1 February 1784)
1780s
Context: I am become a private citizen on the banks of the Potomac, and under the shadow of my own Vine and my own Fig-tree, free from the bustle of a camp and the busy scenes of public life, I am solacing myself with those tranquil enjoyments, of which the Soldier who is ever in pursuit of fame, the Statesman whose watchful days and sleepless nights are spent in devising schemes to promote the welfare of his own, perhaps the ruin of other countries, as if this globe was insufficient for us all, and the Courtier who is always watching the countenance of his Prince, in hopes of catching a gracious smile, can have very little conception. I am not only retired from all public employments, but I am retiring within myself; and shall be able to view the solitary walk, and tread the paths of private life with heartfelt satisfaction. Envious of none, I am determined to be pleased with all; and this my dear friend, being the order for my march, I will move gently down the stream of life, until I sleep with my Fathers.

Garantissez-moi de mes amis, écrivait Gourville proscrit et fugitif, je saurai me défendre de mes ennemis. ("Defend me from my friends," wrote Gourville, exile and fugitive, "I can defend myself from my enemies.") — Gabriel Sénac de Meilhan, Considérations sur l'esprit et les moeurs (1788): "De L'Amitié." Sénac de Meilhan was quoting Jean Hérault, sieur de Gourville (1625 - 1703).
The remark has often been attributed to Voltaire and to Claude-Louis-Hector de Villars.
Misattributed

Source: The Boy in the Striped Pajamas

Books, Shock Value: A Tasteful Book About Bad Taste (1981)

Source: https://guardian.ng/life/spotlight/sisi-yemmie-the-inspirational-vlogger/ Sir yemmie speaking at an interview.

Variant: You will lose what you value most...

It hadn't been me that Rhonda was talking about. It hadn't even been Dimitri's life.

What you value most.

It had been his soul.
Source: Spirit Bound

http://www.maxboxing.com/Goldman/eddieg071603.asp
On his fans

As quoted in "Manmohan speaks out: Never used public office to enrich self" http://www.hindustantimes.com/india-news/manmohan-singh-speaks-out-never-used-public-office-for-own-benefits-bjp-harping-on-graft-to-divert-attention/article1-1351757.aspx, Hindustan Times (27 May 2015)
2011-present