Psalms 34:10

The comparison is chosen for shock. Young lions are the strongest hunters in that landscape: fast, in their prime, working in groups, at the top of every food chain around them. If anyone eats, they eat.

And the psalm says they go hungry. Not that they might. They do lack, and suffer hunger — stated as an observed fact, which anyone who has watched predators knows is true. Strength is not a guarantee of supply. The most capable animal in the valley still has bad weeks.

Against that: those who seek Yahweh shall not lack any good thing. The contrast is between two strategies, not two levels of effort. The lion's method is competence, and competence is real but it fails intermittently. The other method is seeking, and the psalm claims it does not fail.

The qualifier is where the verse becomes honest. Any good thing. Not anything. David, who wrote this after escaping a king by pretending to be insane, was not describing a life in which he got what he wanted. He is drawing a boundary around the promise, and putting the definition of good on the other side of it.

That is either a dodge or the most useful part of the verse, depending on whether you trust the one doing the defining. The psalm assumes you do — and spends its opening verses giving reasons.