For the pedantic:
Strictly speaking, 'fountain of all knowledge' is correct rather than 'fount' or 'font'. All three are used nowadays, but the original ?fountain' version was a 17th century quote and the other two are just more modern variants of that original.
The quote is from 'An Essay Concerning Human Understanding' by the philosopher, John Locke, published in 1690. Clearly, in it he was referring to God.