“A trifling debt makes a man your debtor; a large one makes him an enemy.”
Source: Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter XIX: On worldliness and retirement, Line 11.
Original
Leve aes alienum debitorem facit, grave inimicum.
Help us to complete the source, original and additional information
Seneca the Younger 225
Roman Stoic philosopher, statesman, and dramatist -4–65 BCRelated quotes

“Better make a weak man your enemy than your friend.”
Affurisms. From Josh Billings: His Sayings (1865)

[Baqir Sharīf al-Qurashi, The life of Imam Muhammad al-Jawad, Wonderful Maxims and Arts, 2005]

Diary (13 July 1879)
Diary and Letters of Rutherford Birchard Hayes (1922 - 1926)

Article for Zeit (20 April 1924), quoted in W. M. Knight-Patterson, Germany. From Defeat to Conquest 1913-1933 (London: George Allen and Unwin, 1945), p. 348
1920s

Principal Speech Against Unconditional Repeal (16 August 1893)

The Bomb and the Opportunity (March 1946)
“No plan survives the first encounter with your enemy, so why bother to make one?”
Source: The Goblin Quest Series, Goblin Hero (2007), Chapter 13 (p. 243)
The Complete Neurotic's Notebook (1981), Women & men