From MN 36: https://suttacentral.net/mn36/en/sujato?

Suppose there was a green, sappy log, and it was lying in water. Then a person comes along with a drill-stick, thinking to light a fire and produce heat. What do you think, Aggivessana? By drilling the stick against that green, sappy log lying in the water, could they light a fire and produce heat?”

“No, Master Gotama. Why not? Because it’s a green, sappy log, and it’s lying in the water. That person will eventually get weary and frustrated.” …

“Whoever has not given up the defilements that are corrupting, leading to future lives, hurtful, resulting in suffering and future rebirth, old age, and death is deluded, I say. For it’s not giving up the defilements that makes you deluded. Whoever has given up the defilements that are corrupting, leading to future lives, hurtful, resulting in suffering and future rebirth, old age, and death—is not…