It is by doubting that we come to investigate and by investigating that we recognize the truth.

The key to wisdom is this - constant and frequent questioning for by doubting we are led to question and by questioning we arrive at the truth.

Believe those who are seeking the truth. Doubt those who find it.

Who never doubted never half believed. Where doubt is there truth is - it is her shadow.

Beyond a doubt truth bears the same relation to falsehood as light to darkness.

Doubt indulged and cherished is in danger of becoming denial but if honest and bent on thorough investigation it may soon lead to full establishment of the truth.

When in doubt tell the truth.

If you would be a real seeker after truth it is necessary that at least once in your life you doubt as far as possible all things.

Truth is beautiful without doubt but so are lies.

Our authorities leave us no doubt that the trust lodged with the oligarchy was sometimes abused but it certainly ought not to be regarded as a mere usurpation or engine of tyranny.

Better to trust the man who is frequently in error than the one who is never in doubt.

In your hands or that of any other person so much power would no doubt be dangerous. I am the only man in the world whom it would be safe to trust with it. Remember I am a prophet!

I know it when I don't know it. Sometimes I know it when I don't think I know it. I need to trust myself in these moments these rare moments of self-doubt.

When we are sure that we are on the right road there is no need to plan our journey too far ahead. No need to burden ourselves with doubts and fears as to the obstacles that may bar our progress. We cannot take more than one step at a time.

Ezra was right half the time and when he was wrong he was so wrong you were never in any doubt about it.

When in doubt take more time.

I'd like to say to all my fans out there thanks for the support. And to all my doubters thank you very much because you guys have also pushed me.