Knowledge and courage contribute in turn to greatness. Since they are immortal, they immortalize. You are as much as you know, and a wise person can … - Baltasar Gracián

You are as much as you know, and a wise person can do anything. A person without knowledge is a world in darkness.

In heaven, everything is good; in hell, everything bad. In the world, since it lies between the two, you find both. We are placed between two extremes, and so participate in both. Good and bad luck alternate; not all is happy, nor all hostile. This world is a zero: on its own, it's worth nothing; joined to heaven, a great deal. Indifference to its variety constitutes good sense - the wise are never surprised. Our life is arranged like a play, everything will be sorted out in the end. Take care, then, to end it well.

Complaints will always discredit you. Rather than compassion and consolation, they provoke passion and insolence, and encourage those who hear our complaints to behave like those we complain about. Once divulged to others, the offenses done to us seem to make others pardonable. Some complain of past offenses and give rise to future ones.

Diligence removes impossibilities.