True Knowledge

"True knowledge is knowing you know nothing" - Socrates

About Meaning in Life

"Ultimately, man should not ask what the meaning of his life is, but rather must recognize it is he who is asked. In a word, each man is questioned by his life; and he can only answer to his life by answering for his own life, to life he can only respond by being responsible." Victor Frankl

In addition, I would add, we owe it to all humanity, to be as kind as possible to each other.