Thomas Henry Huxley

"The improvement of natural knowledge is an almost boundless field."

"Man may not be in the strict sense a political animal, but he is naturally a social being."

"Do what you can, with what you have, where you are right now."

"There is no greater cruelty than the cruelty of ignorance."

"Mathematics is the language in which God wrote the world."

"Wisdom is found only in truth. Nothing but truth will satisfy forever."

"The most cautious word has a treacherous power when authority is behind it."

"My books are intended to make it clear that whatever may be true of the details, the broad facts of the life story of the earth are firm."

"The method of scientific investigation is nothing but the expression of the necessary mode of working of the human mind."

"I am afraid of no man, but I respect the opinions of wise men."

"Nature is not cruel, only we are cruel in our interpretation of her."

"If there is a hell upon earth, it is to be found in the bosom of the ambitious man."

"The struggle for existence holds as much for man as for lower creatures."

"Man is capable of understanding the whole of nature's laws."

"Every reader is inclined to believe that he has a right to see the proofs of these assertions."

"The mind, once stretched by a new experience, never returns to its original dimensions."

"Patience and tenacity are the master keys to success."

"The future depends on the present just as truly as it depends on the past."

"I have always been of the opinion that hard work is simply a gathering and arrangement of facts."

"There is no surer mark of the absence of the highest moral and intellectual qualities than a cold and impartial demeanor."

"The secret of genius is to carry the spirit of the child into old age."

"One of the commonest weaknesses in a practical man is thinking that he has no need of theorizing."

"I have not the smallest doubt that the theory of life which appeals to our minds through its beauty and consistency is true."

"Doubt everything at least once, even the assertion that two and two make four."

"The greatest tragedy of science is the slaying of a beautiful hypothesis by an ugly fact."

"The man who has trained his mind to do its work well is the master of his destiny."

"There is nothing stronger than gentleness and nothing gentler than strength."

"To classify wisely, one must clearly understand what one is classifying."

"True science is not cold and analytical; it is warm with the love of truth."

"The good old times are not just the past, but reside in the human heart."