Cherish your doubts, for doubt is the attendant of truth.

Doubt is the key to the door of knowledge; it is the servant of discovery.

A belief which may not be questioned binds us to error, for there is incompleteness and imperfection in every belief.

Doubt is the touchstone of truth; it is an acid which eats away the false.

Let no one fear the truth, that doubt may consume it; for doubt is a testing of belief.

The truth stands boldly and unafraid; it is not shaken by the testing:

For truth, if it be truth, arises from each testing stronger, more secure.

Those that would silence doubt are filled with fear; their houses are built on shifting sands.

But those who fear not doubt, and know its use, are founded on rock.

They shall walk in the light of growing knowledge; the work of their hands shall endure.

Therefore let us not fear doubt, but let us rejoice in its help:

It is to be the wise as a staff to the blind; doubt is the attendant of truth.