“He who conquers others is strong; he who conquers himself is mighty" - Lao-tsu
One who can control his thoughts has conquered himself.”
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Boyd K. Packer 14
American Mormon leader 1924–2015Related quotes

“He who controls others may be powerful, but he who has mastered himself is mightier still.”
Variant: He who conquers others is strong; He who conquers himself is mighty.

Venizelos speaking to Greek sailors at the beginning of the First Balkan War.
Source: [Chester, S. M., Life of Venizelos, with a letter from His Excellency M. Venizelos, Constable, 1921, London, http://www.archive.org/download/lifeofvenizelosw00chesuoft/lifeofvenizelosw00chesuoft.pdf], p. 162

Riyadh-as-Saliheen by Imam Al-Nawawi, 647 https://bewley.virtualave.net/riyad4.html
Sunni Hadith

“Who himself cannot control
Why should he o'er others rule?”
Quem não é senhor de si
Porque o será de ninguém?
Farsa dos Físicos (1512?), tr. Aubrey F. G. Bell

“A man can only rise, conquer, and achieve by lifting up his thoughts.”

Three Discourses at Friday Communion November 14, 1849 Hong translation 1997 P. 119-120
1840s, Three Discourses at the Communion on Fridays (1849)