There is something calming and emotionally restoring when you focus on gratitude for a known deed that helped you, instead of fear of the unknown.

You've got to bumble forward into the unknown.

Exploring the unknown requires tolerating uncertainty.

We are only puppets, our strings are being pulled by unknown forces.

People have a hard time letting go of their suffering. Out of a fear of the unknown, they prefer suffering that is familiar.

Failure is a word unknown to me.

Rare indeed is the person who is neutral about the unknown.

Perhaps some day someone will explain how, on the level of man, Auschwitz was possible; but on the level of God, it will forever remain the most disturbing of mysteries.

The unknown always passes for the marvellous.

Once men are caught up in an event they cease to be afraid. Only the unknown frightens men.

We are ignorant of the Beyond because this ignorance is the condition sine qua non of our own life. Just as ice cannot know fire except by melting, by vanishing.

Our dream dashes itself against the great mystery like a wasp against a window pane. Less merciful than man, God never opens the window.

Would there be this eternal seeking if the found existed?

Penetrating so many secrets, we cease to believe in the unknowable. But there it sits nevertheless, calmly licking its chops.

Tis very puzzling on the brink Of what is called Eternity to stare, And know no more of what is here, than there.

The difference between what the most and the least learned people know is inexpressibly trivial in relation to that which is unknown.

Grieve not, because thou understandest not life's mystery; behind the veil is concealed many a delight.

Between the idea And the reality Between the motion And the act Falls the Shadow.

All is riddle, and the key to a riddle is another riddle.

The fairest thing we can experience is the mysterious. It is the fundamental emotion which stands at the cradle of true art and true science.