Think not so much of what thou hast not as of what thou hast: but of the things which thou hast select the best, and then reflect how eagerly they would have been sought, if thou hadst them not. At the same time however take care that thou dost not through being so pleased with them accustom thyself to overvalue them, so as to be disturbed if ever thou shouldst not have them.

Retire into thyself. The rational principle which rules has this nature, that it is content with itself when it does what is just, and so secures tranquility.

Wipe out the imagination. Stop the pulling of the strings. Confine thyself to the present. Understand well what happens either to thee or to another. Divide and distribute every object into the causal [formal] and the material. Think of thy last hour. Let the wrong which is done by a man stay there where the wrong was done.

Direct thy attention to what is said. Let thy understanding enter into the things that are doing and the things which do them.