When adults choose to be willfully ignorant, it is pretty much impossible to try and help them. If your socratic method works, that'd be the best, but even if it fails don't lose hope, rather prepare yourself to support him when he needs to get back on his feet again. It might sometimes be better to let them stumble and fall a bit before they learn their lesson
Quote:To know yet to think that one does not know is best; Not to know yet to think that one knows will lead to difficulty.
- Lau Tzu
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