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True progress in farming comes from observing and learning from nature.

The concept of freedom is inseparable from the concept of truth.

The great question which, in all ages, has disturbed mankind, and brought on them the greatest part of their mischiefs, has been, not whether there be power in the world, nor whence it came, but who should have it.

真正的喜悅精神、崇高感、超越人類的感覺，這是最高卓越的試金石，在數學中同樣可以在詩歌中找到。

動作從不撒謊。

I have held many things in my hands, and I have lost them all; but whatever I have placed in God's hands, that I still possess.