Always follow these two rules: first, act only on what your reasoning mind proposes for the good of humanity, and second, change your opinion if someone shows you it's wrong. This change of mind must proceed only from the conviction that it's both correct and for the common good, but not because it will give you pleasure and make you popular.

There is change in all things. You yourself are subject to continual change and some decay, and this is common to the entire universe.

A man's worth is no greater than his ambitions.

Does what's happened keep you from acting with justice, generosity, self-control, sanity, prudence, honesty, humility, straightforward ness, and all other qualities that allow a person's nature to fulfill itself? So remember this principle when something threatens to cause you pain: the thing itself was no misfortune at all; to endure it and prevail is great good fortune.

Whatever anyone does or says, I must be emerald and keep my colour.

Dig inside. Inside is the fountain of good, and it will forever flow, if you will forever dig.

Men despise one another and flatter one another; and men wish to raise themselves above one another, and crouch before one another.