“Whoever despises the high wisdom of mathematics nourishes himself on delusion and will never still the sophistic sciences whose only product is an eternal uproar.”

“A diamond is just a lump of coal that stuck to its job.”

“Make your work to be in keeping with your purpose”

“Nature is constrained by the cause of her laws which dwell inborn in her. Variant: Nature is constrained by the order of her own law which lives and works within her.”

“Every obstacle is destroyed through rigor.”

“The hard soil and four months of snow make the inhabitants of the northern temperate zone wiser and abler than his fellow who enjoys the fixed smile of the tropics.”

“A man is reputed to have thought and eloquence; he cannot, for all that, say a word to his cousin or his uncle. They accuse his silence with as much reason as they would blame the insignificance of a dial in the shade. In the sun it will mark the hour. Among those who enjoy his thought, he will regain his tongue.”

“Age, like woman, requires fit surroundings.”