There cannot be mental atrophy in any person who continues to observe, to remember what he observes, and to seek answers for his unceasing hows and whys about things.

When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us.

The day will come when the man at the telephone will be able to see the distant person to whom he is speaking.

Before anything else, preparation is the key to success.

The only difference between success and failure is the ability to take action.

The achievement of one goal should be the starting point of another.

Don't keep forever on the public road, going only where others have gone and following one after the other like a flock of sheep. Leave the beaten track occasionally and dive into the woods.

Great discoveries and improvements invariably involve the cooperation of many minds.

Sometimes we stare so long at a door that is closing that we see too late the one that is open.

You cannot force ideas. Successful ideas are the result of slow growth. Ideas do not reach perfection in a day, no matter how much study is put upon them.

Concentrate all your thoughts upon the work at hand. The sun's rays do not burn until brought to a focus.

If your feet are firmly planted on the ground you'll never be able to dance.

The uncertainty of the future is a great blessing for us humans! Let the road ahead of us be completely unknown for us so that we can have the marvellous joy of discovering it!

Jack, I think I'm having a mid-life crisis. Oh Mom, you're way too old to be having a mid-life crisis.

It feels good to turn on the TV and have options, a variety. That's why television is so good.

The societal division of labor obtains the dignity of an ontological condition.

Hide them all, then. Keep her – them – safe. Please.' And what will you give me in return, Severus?' In – in return? Anything.

All magic is 'Here’s a quarter, now it’s gone. You’re a jerk. Now it’s back. You’re an idiot. Show’s over.'

I regard this conclusion as coming in the same sort of category, of historical probability so high as to be virtually certain, as the death of Augustus in AD 14 or the fall of Jerusalem in AD 70

It's more fun to play a good character with a good director and good actors around you. That's what makes it fun, and the more variety, the better.