It is not enough to have a good...

It is not enough to have a good mind; the main thing is to use it well.

--Rene Descartes

See this quotation on Prometheus Unplugged.

Before God we are all equally wise...

Before God we are all equally wise - and equally foolish.

--Albert Einstein

Is not wisdom found among...

Is not wisdom found among the aged? Does not long life bring understanding?

- Bible, Job 12:12

He was a wise man who...

He was a wise man who originated the idea of God.

--Euripides

A wise man is cured of ambition...

A wise man is cured of ambition by ambition itself; his aim is so exalted that riches, office, fortune and favour cannot satisfy him.

--Samuel Johnson

Intelligence is quickness to apprehend...

Intelligence is quickness to apprehend as distinct from ability, which is capacity to act wisely on the thing apprehended.

--A. N. Whitehead