Whatever you have, you must either use or lose.
A human person is infinitely precious and must be unconditionally protected.
Life is a succesion of lessons which must be lived to be understood.
In this world a man must either be anvil or hammer.
You Must not keep the light for yourself, but share it with others to come.
Justice must not only be seen to be done but has to be seen to be believed.
Leaders must have splendid flavour of pretending for contending situations.
I've heard some duff Irish accents. The worst must be Mickey Rourke.
Why must we be eternally on our knees before the Kants and Hugos?
We must say something, even when we know nothing.
According as the man is, so must you humour him.
You must be fit to give before you can be fit to receive.
I've made a decision and now I must face the consequences.
You must never underestimate your opposition.
Every human must take responsibility for his actions.
Win if you can, lose if you must, but always cheat.
In order to fly, all one must do is simply miss the ground.
In Israel, in order to be a realist you must believe in miracles.
When one is writing a novel in the first person, one must be that person.
What cannot be said above all must not be silenced but written.
You cannot dream yourself into a character; you must hammer and forge yourself one.