Let every action aim solely at the common good.

You have power over your mind - not outside events. Realize this, and you will find strength.

The stream of tendency in which all things seek to fulfill the law of their being.

As for life, it is a battle and a sojourning in a strange land; but the fame that comes after is oblivion.

Enough of this wretched life and murmuring and apish tricks. Why art thou disturbed? What is there new in this? What unsettles thee? Is it the form of the thing? Look at it. Or is it the matter? Look at it. But besides these there is nothing. Towards the gods, then, now become at last more simple and better. It is the same whether we examine these things for a hundred years or three.

Be like the rocky headland on which the waves constantly break. It stands firm, and round it the seething waters are laid to rest.

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.