He suffered incessantly from the fact that his critical faculties transcended his constructive capacities. In a manner of speaking, his critical sense robbed him of his love for the offspring of his own mind even before they were born.

How strange is the lot of us mortals! Each of us is here for a brief sojourn; for what purpose he knows not, though he senses it. But without deeper reflection one knows from daily life that one exists for other people.

Three rules of work: Out of clutter find simplicity; From discord find harmony; In the middle of difficulty lies opportunity.

Don't listen to their words, fix your attention on their deeds.

Black holes are where God divided by zero.

What is inconceivable about the universe is that it is at all conceivable.

Order is needed by the ignorant but it takes a genius to master chaos.