Ambiguity supposes eventual resolution of itself whereas certitude implies further ambiguity.

To learn which questions are unanswerable, and not to answer them: this skill is most needful in times of stress and darkness.

When I was young I was sure of everything; in a few years, having been mistaken a thousand times, I was not half so sure of most things as I was before; at present, I am hardly sure of anything but what God has revealed to me.

It's got a huge amount of ambiguity in it,

If we insist on being as sure as is conceivable... we must be content to creep along the ground, and can never soar.

There is no such thing as absolute certainty, but there is assurance sufficient for the purposes of human life.