He who leaves God out of his reasoning does not know how to count.
Italian proverb

Atheism is rather in the lip, than in the heart of man.
Francis Bacon (1561-1626)

He that will believe only what he can fully comprehend must have a very long head or a very short creed.
Charles Caleb Colton (1780-1832)

The greatest question of our time is not communism versus individualism, not Europe versus America, not even the east versus the West: it is whether man can bear to live without God.
Will Durant (1885-1981)

Apart from God every activity is merely a passing whiff of insignificance.
Alfred North Whitehead (1861-1947)

In form, the word "God" is small indeed, but in meaning it is infinite. It expresses the greatest thought that ever entered the heart of man. It is lisped by the children, read and known of all men; but also inscribed at the zenith of the universe, and shedding its glory on all below it.
Harvey William Everest (1831-1900)

There are many truths the full meaning of which cannot be recognized until personal experience has brought it home.
John Stuart Mill (1806-1873)

Everything that cannot be understood does nevertheless not cease to exist.
Blaise Pascal (1623-1662)

Let us not pretend to doubt in philosophy what we do not doubt in our hearts.
Charles Sanders Peirce (1839-1914)

The unrest of this weary world is its unvoiced cry after God.
Theodore T. Munger (dates uncertain)