Noun
a prerequisite
Source: WordNetSoul-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. Charles Spurgeon
Winning the Revolutionary War, or the Civil War, or World War II were the turning points in our history, the sine qua non of our forward progress. Stephen Ambrose
Taking charge of your own learning is a part of taking charge of your life, which is the sine qua non in becoming an integrated person. Warren Bennis
Sound money is the sine qua non of a prosperous society. Arthur Laffer
The psycho-physiological hypothesis is both inductively and deductively the sine qua non of the science of psychology. Boris Sidis
Conflict is the gadfly of thought. It stirs us to observation and memory. It instigates invention. It shocks us out of sheep-like passivity, and sets us at noting and contriving...conflict is a sine qua non of reflection and ingenuity. John Dewey