In this possibly terminal phase of human existence, democracy and freedom are more than just ideals to be valued - they may be essential to survival. Noam Chomsky
Why should it be essential to love rarely in order to love much? Albert Camus
They [root causes of terror] come out of a long dialectic of U.S. involvement in the affairs of the Islamic world, the oil-producing world, the Arab world, the Middle East - those areas that are considered to be essential to U.S. interests and security. Edward Said
To achieve such a uniform description of nature, it appears to be essential to have recourse to the archetypal background of the scientific terms and concepts. Wolfgang Pauli
I live in Dublin, God knows why. There are greatly more congenial places I could have settled in - Italy, France, Manhattan - but I like the climate here, and Irish light seems to be essential for me and for my writing. John Banville
The frail, vulnerable sounds of which we are capable seem to be essential to a later ability to roar like a lion without scaring everyone to death. David Whyte