It consists in facing danger or enduring pain, to avoid greater possible evils.

_Justice_ is of artificial origin.

It consists in a tacit agreement among mankind to abstain from injuring one another.

The security that every man has in his person and property, is the great consideration urging to abstinence from injuring others.

But is it not possible to commit injustice with safety?
The answer was, 'Injustice is not an evil in itself, but becomes so from the fear that haunts the injurer of not being able to escape the appointed avengers of such acts.' The Physics of Epicurus were borrowed in the main from the atomic theory of Democritus, but were modified by him in a manner subservient and contributory to his ethical scheme.