The main task in life is to give birth to ourselves, to become what we potentially are.

挑战让生活有趣，克服它们让生活有意义。

It must be remembered that while sympathy with joy intensifies the sum of joy in the world., sympathy with pain does not really diminish the amount of pain. It may make man better able to endure evil, but the evil remains.

石油化工的未来在于可持续性和高效性。