1. Some skepticism would be useful to a scientist to avoid losing much time.
2. A man who dares to waste one hour of time has not discovered the value of life.
3. Never make friends with a person whom you cannot respect.
4. I love fools’ experiments. I am always making them.
5. My main pleasure and the only activity throughout my life was scientific work, and the excitement caused by it lets me to forget for a time or completely suppress my persistent feeling ill.
6. Of all the differences between man and the lower animals the moral sense or conscience is by far the most important. It is summed up in that short but imperious word “ought.”
7. A monkey, after getting drunk on brandy, would never touch it again, and thus was wiser than many men.
8. The highest stage in moral culture at which we can arrive, is when we recognize that we ought to control our thoughts.
9. Some of the great discoveries that have advanced science can be named “easy,” but not in the sense that they were easy to make, but in the sense that once they were made, they are easy to understand to everyone.
10. The probability of life originating from accident is comparable to the probability of the unabridged dictionary resulting from an explosion in a printing shop.