Courage is the thing. All goes if courage goes.

Find out who you are. And do it on purpose.

I long to accomplish a great and noble task; but it is my chief duty to accomplish small tasks as if they were great and noble

The fact that the great scientist believed in flying machines was the one thing that encouraged us to begin our studies.

He was a dreamer, a thinker, a speculative philosopher... or, as his wife would have it, an idiot.

Gratitude is an illness suffered by dogs.

The secret of health for both mind and body is not to mourn for the past, nor to worry about the future, but to live the present moment wisely and earnestly.

Sovereignty is not given, it is taken.

The way to become rich is to put all your eggs in one basket and then watch that basket.

Work gives you meaning and purpose and life is empty without it.

Life isn't about finding yourself. Life is about creating yourself.

If you enter this world knowing you are loved and you leave this world knowing the same, then everything that happens in between can be dealt with.

I don't think necessity is the mother of invention. Invention ... arises directly from idleness, possibly also from laziness. To save oneself trouble.

It's the possibility of having a dream come true that makes life interesting.

We need never be ashamed of our tears.

Great spirits have always encountered violent opposition from mediocre minds.

In a day, when you don't come across any problems - you can be sure that you are travelling in a wrong path.

To go too far is as bad as to fall short.

Know thyself.

A goal is not always meant to be reached, it often serves simply as something to aim at.

Only those are fit to live who do not fear to die; and none are fit to die who have shrunk from the joy of life and the duty of life. Both life and death are parts of the same Great Adventure.