A happy life consists in tranquility of mind.

Art is born of the observation and investigation of nature.

All pain is either severe or slight, if slight, it is easily endured; if severe, it will without doubt be brief.

Thou knowest how numerous this tribe is, how united and how powerful in the assemblies. I will plead in a low voice so that only the judges may hear, for instigators are not lacking to stir up the crowd against me, and against all the best citizens. To scorn, in the interest of the Republic, this multitude of Jews so often turbulent in the assemblies shows a singular strength of mind. The money is in the Treasury; they do not accuse us of theft; they seek to stir up hatreds.

There is in fact a true law namely right reason, which is in accordance with nature, applies to all men and is unchangeable and eternal. ... It will not lay down one rule at Rome and another at Athens, nor will it be one rule today and another tomorrow. But there will be one law eternal and unchangeable binding all times and upon all peoples.

Democritus maintains that there can be no great poet without a spite of madness.

Hatred is a settled anger.