For every dark night, there's a brighter day.

Every child comes with the message that God is not yet discouraged of man.

No matter how dark the night may seem, it is still just night, and morning is bound to come.

I'd rather be an optimist and a fool than a pessimist and right.

My view is that at a younger age your optimism is more and you have more imagination etc. You have less bias.

If you get No as an answer, remember N.O. means "Next Opportunity". So Let's be positive.