The last moment is past; this moment is present; and, the next moment will be future. The past, present, and future change with every tick of the clock.

An investment in knowledge pays the best interest. 

Be sure you put your feet in the right place, then stand firm.

I feel exhausted if I teach too long.

The chief function of the body is to carry the brain around.

Let each know that for each the body, the mind and the soul have been forced to fulfill themselves. 

 It is human beings’ sinister mind that produces viruses as biological weapons.

I do not believe in the God of theology who rewards good and punishes evil.

I have gained this from philosophy: that I do without being commanded what others do only from fear of the law.

Those who educate children well are more to be honored than they who produce them; for these only gave them life, those the art of living well.

 Spirituality is beyond rituals.

War is mainly a catalogue of blunders.