“Aristippus said that a wise man’s country was the world.”
Aristippus, 13.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 2: Socrates, his predecessors and followers
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Diogenes Laërtius 107
biographer of ancient Greek philosophers 180–240Related quotes

“A wise man once said, "never discuss philosophy or politics in a disco environment."”
Interview with Grace Slick on Rockplace (11 February 1984).

Concurring, Dennis v. United States, 339 U.S. 162, 184 (1950).
Judicial opinions

“If any man among you seemeth to be wise in this world, let him become a fool, that he may be wise.”
1 Corinthians 3:18 (KJV)
First Epistle to the Corinthians

“The best fights are the ones you don't have", a wise man once said to me.”
Source: The Affair

“It takes a wise man to discover a wise man.”
Xenophanes, 3.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 9: Uncategorized philosophers and Skeptics