Peaceably if we can, forcibly if we must.

You must go or send a substitute.

“Artists must be sacrificed to their art.”

The trees must breathe so I can breathe.

We must be still before God.

You must own it to play it.

Fear must be conquered with faith.

To have joy, one must share it.

You must seek to thyself.

The hearts that never lean must fall.

Only what is essential must be said.

Discipline must be maintained.

You must feel attractive to be attractive.

It is during our darkest moments that we must focus to see the light.

We must always attempt to lift as we climb

Poetry must be as new as foam & old as rock.

Still, one does what one must.

Happiness must be grown in one's own garden.

What is really beautiful must always be true.

The undevout astronomer must be mad.

We must kill the savage to save the man.