Human being is a plant that makes thoughts blossom and bear fruit, just like roses blooming on a rose tree and apples on an apple tree. ——Antoine Fabre Dorivi

Life is extended in development, because thought is the measure of life. ——Leland

The entire history of mankind has warned wise people not to believe in fortune but in ideas. ——Ai Xiansheng

Without freedom of thought, there is no science and no truth. ——Renan

After many ideas are transferred into the minds of others, they will grow stronger than where they originally grew. ——Oliver Wendell Holmes, Jr.

He who kills his thoughts is the greatest murderer. ——Romain Rolland

Thought is the slave of life, and life is the trick of time. ——Shakespeare

The human mind is like a clock, it is easy to stop and needs to be wound up frequently. ——V. Herzlit

The dirt on the mind cannot be erased by the passing of time, nor can it be washed away with water. ——Cicero

It takes extraordinary thought to analyze the obvious. ——Whitehead

Only noble thoughts, but no noble blood. ——Germany

Ideological efforts, like the seeds that can grow a big tree, are invisible to the eyes. But significant changes in human society are taking place within it.

——Tolstoy