Truly mature people understand one principle: don’t touch what you don’t understand. This isn’t cowardice—it’s respect for your own cognitive boundaries. Many failures aren’t due to a lack of effort, but because in areas you don’t understand, you replace your own judgment with someone else’s. When others succeed, it’s because they’ve figured it out; if you haven’t, following along is just gambling. The truly important ability in life isn’t seizing every opportunity—it’s knowing which opportunities don’t belong to you. Understand first, then act; before you’ve figured it out, staying restrained is the lowest-cost way to avoid most mistakes.