المهم في العلم هو الفهم لا التقانة .

“Anyone who has never made a mistake has never tried anything new.”

“He to whom this emotion is a stranger, who can no longer pause to wonder and st…”

“Isn't it strange that I who have written only unpopular books should be such a …”

“There is no great discoveries and advances, as long as there is an unhappy chil…”