Humans are like fish living in the river of time, lifespan is the length of this fish (affecting time), strength is its breadth (affecting range), and belief or the ability to stir causality is its height (affecting depth).
The boundaries of these three aspects aren't really as clear-cut as the analogy suggests. It's just that the analogy makes it simpler and clearer.
With a long life and strength but without stirring causality, this fish can only wriggle at the riverbed, unnoticed, never breaking the surface, unable to influence the overall situation. The river remains calm, with or without it, making no difference to the world.
A short life and lack of strength but can stir up storms, prove that such a person can cause changes to the world under fortunate coincidences. However, this change is not long-lasting, like a small fish leaping from the water—indeed it can splash, but it cannot truly fundamentally change anything.
