Doubting is but the forefront of faith,
a faith in the infinite growth
of an unbounded creation.

A doubting age is one of restlessness
and discontent with what is current;
a doubt is an idea that is still alive.

To doubt that the past has uncovered all things
is to express faith
that many things are still to be uncovered.

To doubt that we have grown
to our full stature and knowledge
is to express faith that we may develop
into beings of such power and dignity
that we cannot as yet imagine what shall be.

From “The Mishkan T’Filah, a Reform Siddur” (p.405) the prayer book used in Reform Judaism.