Where we have strong emotions, we're liable to fool ourselves. (From the 'Cosmos' television series, 'Blues for the Red Planet')

When you make the finding yourself - even if you're the last person on Earth to see the light - you never forget it.

Comets giveth and comets taketh away.

We're the kind of species that needs a frontier - for fundamental biological reasons. Every time humanity stretches itself and turns a new corner, it receives …

The advantage of the emotions is that they lead us astray:

Mankind naturally and generally love to be flatter'd: Whatever sooths our Pride, and tends to exalt our Species above the rest of the Creation, we are pleas'd …

Youth is ever apt to judge in haste, and lose the medium in the wild extreme.