A mentality of being prepared for potential danger or hardship even when things are going well; a constant state of vigilance against future risks.

survival and growth come from enduring adversity and struggle; often paired with the concept of perishing through easy living

to have gone through a great deal of misery; having experienced many hardships and tribulations

to spend the remainder of one's life in sorrow and hardship; to have survived a life of suffering

Hardship and adversity drive a person to strive and survive, while ease and pleasure can lead to neglect and ruin.