and xxix.
PROP.LVI.

Extreme pride or dejection indicates extreme infirmity of spirit.
Proof .-- The first foundation of virtue is self--preservation (IV.xxii.

Coroll.) under the guidance of reason (IV.

xxiv.).
He, therefore, who is ignorant of himself, is ignorant of the foundation of all virtues, and consequently of all virtues.
Again, to act virtuously is merely to act under the guidance of reason (IV.

xxiv.): now he, that acts under the guidance of reason, must necessarily know that he so acts (II.