To keep is more important than to make friends.
One should cultivate good habits of memory, for it is capable of making existence a Paradise or an Inferno.
It is therefore an excellent device to acquire knowledge from everybody.
Trust your heart, especially when it is a strong one.
Know what is evil, no matter how worshipped it may be. Let the man of sense not mistake it, even when clothed in brocade, or at times crowned in gold, because it cannot thereby hide its hypocrisy, for slavery does not lose its infamy, however noble the master.
Advice is sometimes transmitted more successfully through a joke than grave teaching.