“There is a space between man's imagination and man's attainment that may only be traversed by his longing.”

“There is a fifth dimension beyond that which is known to man ... a dimension as vast as space and as timeless as infinity. It is the middle ground between light and shadow, between science and superstition, and it lies between the pit of man's fears and the summit of his knowledge. This is the dimension of imagination.”

“It belongs to the imperfection of everything human that man can only attain his desire by passing through its opposite.”

“A man may imagine things that are false, but he can only understand things that are true.”

“Human nature with all its infirmities and deprivation is still capable of great things. It is capable of attaining to degrees of wisdom and goodness, which we have reason to believe, appear as respectable in the estimation of superior intelligences. Education makes a greater difference between man and man, than nature has made between man and brute. The virtues and powers to which men may be trained, by early education and constant discipline, are truly sublime and astonishing. Isaac Newton and John Locke are examples of the deep sagacity which may be acquired by long habits of thinking and study.”

“The only absolute knowledge attainable by man is that life is meaningless.”