seful one to another,
and associated among themselves by the closest necessity of
friendship (IV. xxxv., and Coroll. i.), only such men endeavour,
with mutual zeal of love, to confer benefits on each other (IV.
xxxvii.), and, therefore, only they are thoroughly grateful one
to another. Q.E.D.

Note.--The goodwill, which men who are led by blind desire
have for one another, is generally a bargaining or enticement,
rather than pure goodwill. Moreover, ingratitude is not an
emotion. Yet it is base, inasmuch as it generally shows, that a
man is affected by excessive hatred, anger, pride, avarice, &c.
He who, by reason of his folly, knows not how to return benefits,
is not ungrateful, much less he who is not gained over by the
gifts of a courtesan to serve her lust, or by a thief to conceal
his thefts, or by any similar persons. Contrariwise, such an one
shows a constant mind, inasmuch as he cannot by any gifts be
corrupted, to his own or the general hurt.

PROP. LXXII. The free man never acts fraudulently, but always in
good faith.

Proof.--If it be asked: What should a man's conduct be in a
case where he could by breaking faith free himself from the
danger of present death? Would not his plan of self--preservation
completely persuade him to deceive? This may be answered by
pointing out that, if reason persuaded him to act thus, it would
persuade all men to act in a similar manner, in which case reason
would persuade men not to agree in good faith to unite their
forces, or to have laws in common, that is, not to have any
general laws, which is absurd.

PROP. LXXIII. The man, who is guided by reason, is more free in
a State, where he lives under a general system of law, than in
solitude, where he is independent.

Proof.--The man, who is guided by reason, does not obey
through fear (IV. lxiii.): but, in so far as he endeavours to
preserve his being according to the dictates of reason, that is
(IV. lxvi. note), in so far as he endeavours to live in freedom,
he desires to order his life according to the general good (IV.
xxxvii.), and, consequently (as we showed in IV. xxxvii. note.
ii.), to live according to the laws of his country. Therefore
the free man, in order to enjoy greater freedom, desires to
possess the general rights of citizenship. Q.E.D.

Note.--These and similar observations, which we have made on
man's true freedom, may be referred to strength, that is, to
courage and nobility of character (II