“Self-conceit is the enemy of progress.”
As quoted by Diogenes Laërtius, iv. 50.
Help us to complete the source, original and additional information
Bion of Borysthenes 14
ancient greek philosopher -325–-246 BCRelated quotes

“5115. 'Tis Self-Conceit, that makes Opinion obstinate.”
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)

“Our self-esteem and conceit are European, but our culture and actions are Asiatic.”
Note-Book of Anton Chekhov (1921)

“Talent is God-given; be humble. Fame is man-given; be thankful. Conceit is self-given; be careful.”
They Call Me Coach (1972)
Variant: Talent is God-given; be humble. Fame is man-given; be thankful. Conceit is self-given; be careful.

“Stupid people, people who do not know how to laugh, are always pompous and self-conceited.”
Sketches and Travels in London; Mr. Brown's Letters to His Nephew: "On Love, Marriage, Men and Women" (1856).


From a letter sent to the Communist Party of Vietnam, quoted in Vietnam & Trotskyism https://www.marxists.org/history/etol/document/vietnam/pirani/hochiminh.htm (1987)

Source: https://www.youtube.com/watch?v=xiLR4sCgvnc
Context: But now, let’s give each other a chance.
It’s time to put away the harsh rhetoric.
To lower the temperature.
To see each other again.
To listen to each other again.
To make progress, we must stop treating our opponents as our enemy.
We are not enemies. We are Americans.