Plato

"Astronomy compels the soul to look upwards and leads us from this world to another."

"The soul of man is immortal and imperishable, and our virtues will be rewarded after we are gone."

"Wise men speak because they have something to say; fools speak because they have to say something."

"An empty vessel makes the loudest sound, so they that have the least wit are the greatest blabberers."

"The prison-house of the body keeps the soul in captivity until philosophy shall free her."

"Until philosophers are kings, or the kings and princes of this world have the spirit and power of philosophy, cities will never cease from evils."

"Honesty is the foundation upon which all other virtues rest."

"The human soul is immortal and eternal."

"No one is more hated than he who speaks the truth."

"The god of youth has hitherto been a wholly imaginary divinity."

"A good decision is based on knowledge and not on numbers."

"The object of education is to teach us to love what is beautiful."

"Courage is endurance of the soul in spite of fear."

"The most important thing is not the victory, but to participate in it fully."

"The measure of a life is not its duration, but its donation."

"To be is to do."

"The unexamined life is not worth living in its depths."

"Attention is the rarest and purest form of generosity."

"The desire of knowledge is natural to a good man."

"Music gives a soul to the universe, wings to the mind, flight to the imagination, and life to everything."

"He who commits injustice is ever made more wretched than he who suffers it."

"The same principles which at first lead to happiness, when followed to excess, cease to conduct to happiness, and produce the reverse."

"The first step toward greatness is to be honest."

"Thinking is the talking of the soul with itself."

"For the individual, it is impossible to be wholly free from error."

"The fundamental principle of man's existence is the desire to become himself."

"Courage mixed with humility is not a fearful thing, but a mighty thing."

"The lover of a beautiful soul considers himself the happiest man on earth."

"Words are like shadows and dreams among things."

"The world of ideas is the world of reality."