BOOK IV. Whether the bestowal of benefits and the return of
gratitude for them are desirable objects in themselves? Does God
bestow benefits?--How to choose the man to be benefited--We ought
not to look for any return--True gratitude--Of keeping one's
promise--Philip and the soldier--Zeno

BOOK V. Of being worsted in a contest of benefits--Socrates and
Archelaus--Whether a man can be grateful to himself, or can bestow
a benefit upon himself--Examples of ingratitude--Dialogue on
ingratitude--Whether one should remind one's friends of what one
has done for them--Caesar and the soldier--Tiberius.

BOOK VI. Whether a benefit can be taken from one by force--
Benefits depend upon thought--We are not grateful for the
advantages which we receive from inanimate Nature, or from dumb
animals--In order to lay me under an obligation you must benefit me
intentionally--Cleanthes's story of the two slaves--Of benefits
given in a mercenary spirit--Physicians and teachers bestow
enormous benefits, yet are sufficiently paid by a moderate fee--
Plato and the ferryman--Are we under an obligation to the sun and
moon?--Ought we to wish that evil may befall our benefactors, in
order that we may show our gratitude by helping them?

BOOK VII. The cynic Demetrius--his rules of conduct--Of the truly
wise man--Whether one who has done everything in his power to
return a benefit has returned it--Ought one to return a benefit to
a bad man?--The Pythagorean, and the shoemaker--How one ought to
bear with the ungrateful.