Fix your course on a star and you'll navigate any storm.
Ask counsel of him who rules himself well.
He who does not understand the supreme certainty of mathematics is wallowing in confusion.
Art lives from constraints and dies from freedom.
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 wave is never found alone, but is mingled with as many other waves as there are uneven places in the object where the said wave is produced.