Marcus Aurelius: “Examine men's ruling principles, even those of the wise, what kind of things they avoid, and what kind they pursue.”

Reflecting on all this, consider nothing to be great, except to act as thy nature leads thee, and to endure that which the common nature brings.

There is one intelligent soul, though it seems to be divided.

Depart then satisfied, for he also who releases thee is satisfied.

The safety of life is this, to examine everything all through, what it is itself, that is its material, what the formal part; with all thy soul to do justice and to say the truth.