We are not the owners of this planet, we are merely the current tenants.
我们并非这个星球的所有者，只是当前的租客。
数学的本质在于其自由性。
Death may be the greatest of all human blessings.
我已经注意到有爬山习惯的年轻人长大后通常有所作为。
"The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter."
If you’re not failing, you’re not pushing hard enough.
The real moral test of a society is how it treats those who are at the dawn of life, the children; those who are in the twilight of life, the aged; and those who are in the shadow of life, the sick, the needy and the handicapped.