25. Nature which governs the whole will soon change all things which thou
seest, and out of their substance will make other things, and again other
things from the substance of them, in order that the world may be ever
new (XII. 23).

26. When a man has done thee any wrong, immediately consider with what
opinion about good or evil he has done wrong. For when thou hast seen
this, thou wilt pity him, and wilt neither wonder nor be angry. For
either thou thyself thinkest the same thing to be good that he does or
another thing of the same kind. It is thy duty then to pardon him. But if
thou dost not think such things to be good or evil, thou wilt more
readily be well disposed to him who is in error.

27. 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.

28. 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 tranquillity.

29. 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 (VIII. 29).