Nationalism is an infantile ...

Nationalism is an infantile disease. It is the measles of mankind.
Nationalism is an infantile disease. It is the measles of mankind.

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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

It is characteristic of the military mentality that non-human factors ... are held essential, while the human being, his desires and thoughts-in short, the psychological factors-are considered as unimportant and secondary.
In the middle of every difficulty lies opportunity.
You can't blame gravity for falling in love.
One may say the eternal mystery of the world is its comprehensibility.
The human spirit must prevail over technology.