The foolish undertake a trifling act, and soon desist, discouraged; wise men engage in mighty works, and persevere.
Those who know others are intelligent Those who know themselves have insight. Those who master others have force Those who master themselves have strength.Those who know what is enough are wealthy. Those who persevere have direction. Those who maintain their position endure. And those who die and yet do not perish, live on.
To some degree we all live with uncertainty. We have no control over the future. Yet we carry on, we persevere, because, I guess, it's the way we're made.
The Bible is replete with commands to persevere, especially in the face of injustice.