A practical way to travel between the stars is a must-have for space opera, and a sine qua non for our frequently vaunted future as a galactic society.
For me, politeness is a sine qua non of civilization.
Ownership is a sine qua non of sustainable development.
Liberty is the essential basis, the sine qua non, of morality.
IQ and technical skills are important, but emotional intelligence is the sine qua non of leadership.
Never to allow a patient to be waked, intentionally or accidentally, is a sine qua non of all good nursing.
The psycho-physiological hypothesis is both inductively and deductively the sine qua non of the science of psychology.
Fidelity to the subject's thought and to his characteristic way of expressing himself is the sine qua non of journalistic quotation.
The intimate coupling of two men or two women is not marriage. It is a pale and misshapen counterfeit that will only serve to empty marriage of its meaning and destroy the institution that is the keystone in the arch of civilization... Marriage is the sine qua non for healthy children and a stable society. It is 'fundamental to the very existence and survival of the race.'
Self-realization and self-fulfilment are the sine qua non for human existence.
A clear lesson of history is that a 'sine qua non' for sustained economic recovery following a financial crisis is a thoroughgoing repair of the financial system.
I think the entire message of the psychedelic experience, which is basically the sine qua non of the rebirth of alchemical understanding, the very basis of that understanding is that nature seeks to communicate.
Since survival is the sine qua non, I now define the "moral behavior" as "behavior that tends toward survival".
Climate change is the sine qua non of continued civilization. We either solve this, or it's lights out. Turning into a collective like that is so much more aligned with how humans live and think and change.
Soul-serving requires a heart that beats hard against the ribs. It requires a soul full of the milk of human kindness. This is the sine qua non of success.
Mysticism, in the narrow sense, implies a specific experience which is foreign to most poets and most men, but on the other hand, it represents an instinct which is a human sine qua non.