I personally believe this: We have only today; yesterday's gone and tomorrow is uncertain. That's why they call it the present. And sobriety really is a gift... for those who are willing to receive it.
To succeed, you must have tremendous perserverance... tremendous will. "I will drink the ocean", says the perservering soul; at my will mountains will crumble. Have that sort of energy, that sort of will; work hard, and you will reach the goal.
To live in the presence of great truths and eternal laws, to be led by permanent ideals - that is what keeps a man patient when the world ignores him, and calm and unspoiled when the world praises him.
If my theory of relativity is proven successful, Germany will claim me as a German and France will declare me a citizen of the world. Should my theory prove untrue, France will say that I am a German, and Germany will declare that I am a Jew.
I believe the twenty-first century can become the most important century of human history. I think a new reality is emerging. Whether this view is realistic or not, there is no harm in making an effort.