Ask not what your country can ...

Ask not what your country can do for you, ask what you can do for your country.
Ask not what your country can do for you, ask what you can do for your country.

More phrases

All the great things are simple, and many can be expressed in a single word: freedom, justice, honor, duty, mercy, hope.
I know but one freedom and that is the freedom of the mind.
 Antoine de Saint-Exupéry
Freedom is not worth having if it does not connote freedom to err.
The amount of happiness that you have depends on the amount of freedom you have in your heart.
 Thích Nhất Hạnh
Without freedom of thought, there can be no such thing as wisdom - and no such thing as public liberty without freedom of speech.

Quotes from the same author

Things do not happen. Things are made to happen.
Blight has descended on our regulatory agencies - and a dry rot, beginning in Washington, is seeping into every corner of America - in the payola mentality, the expense account way of life, the confusion between what is legal and what is right.
The greater our knowledge increases the more our ignorance unfolds.
As we express our gratitude, we must never forget that the highest appreciation is not to utter words, but to live by them.
Change is the law of life. And those who look only to the past or present are certain to miss the future.