"Hypotheses help and guide scientific work — the search for truth — as the tiller's plough helps the cultivation of useful plants."

"I have achieved neither fame nor wealth, but I have learned to know the human heart."

"I saw in a dream a table where all the elements fell into place as required."

"To protect the Russian borders from enemies, I would surround the whole country with a continuous wall of vodka."

"The chemist must descend into the depths within himself, and find the spark of an idea to illuminate the darkness."