All progress is precarious, and the solution of one problem brings us face to face with another problem.
— Martin Luther King, Jr.

Existence is no more than the precarious attainment of relevance in an intensely mobile flux of past, present, and future.
Susan Sontag precarious quote

This is a hard and precarious world, where every mistake and infirmity must be paid in full.
— Clarence Day

Still, if you will not fight for the right when you can easily win without bloodshed; if you will not fight when your victory will be sure and not too costly; you may come to the moment when you will have to fight with all the odds against you and only a precarious chance of survival. There may even be a worse case. You may have to fight when there is no hope of victory, because it is better to perish than live as slaves.
— Winston Churchill

Compassion and shame come over one who considers how precarious is the origin of the proudest of living beings: often the smell of a lately extinguished lamp is enough to cause a miscarriage. And to think that from such a frail beginning a tyrant or butcher may be born! You who trust in your physical strength, who embrace the gifts of fortune and consider yourself not their ward but their son, you who have a domineering spirit, you who consider yourself a god as soon as success swells your breast, think how little could have destroyed you!
— precarious quotation by Pliny The Elder