"The greatest invention is the greatest discovery."
"Harmony is its own reward."
Peace
"The path to virtue is not one of knowledge, but of practice."
Life
"The world is but a school of inquiry."
Education
"Choose always the way that seems the best, however rough it might be; custom will soon render it easy and agreeable."
Change
"As long as man continues to be the ruthless destroyer of lower animals, he will never know health or peace."
Peace
"The oldest, shortest words—'yes' and 'no'—are those which require the most thought."
Wisdom
"Silence is better than unmeaning words."
Truth
"Choose rather to be strong of soul than strong of body."
Strength
"Concern should drive us into action and not into a depression."
Motivation
"It is forbidden to violate the laws of nature."
Nature
"Health is the greatest wealth."
Health
"In this world there are two tragedies. One is not getting what one wants, and the other is getting it."
Happiness
"Remember that you cannot teach a man anything, you can only help him find it within himself."
Education
"Do not allow yourself to imagine that you are wiser than others, but rather believe yourself inferior in wisdom to all."
"The man who cannot be harsh will never accomplish great things."
Leadership
"Beware of those who attempt to stir you up against one another."
Friendship
"Wisdom is not in words, but in works."
Knowledge
"Do not look at the world with skepticism; look upon the world with wonder."
Imagination
"When the darkness of folly surrounds you, think of the light of truth."
Faith
"To do great deeds, one must live greatly."
Dreams
"All human beings are equal in death."
Death
"By desiring little, a poor man becomes rich."
Money
"The gods have given humans ears to learn from one another."
Wisdom
"If you would be a real seeker of truth, it is necessary that at least once in your life you doubt, as far as possible, all things."
Truth
"Know thyself, and thou shalt know all the mysteries of the gods and of the universe."
"A friend is an alter ego."
Friendship
"Do not let your mind be enslaved by the thoughts of others."
Freedom
"The measure of a man is what he does with power."
Power
"Number is the ruler of forms and ideas, and the cause of gods and demons."
Science