Sometimes you meet someone and think she/he must be a genius. Coming up with ideas you wouldn’t in a million years, broad knowledge about (seems) everything. But if you look at what this person has achieved, you find nothing or at least nothing remarkable. Or far less than you would expect listening to the words.
I’ve learned one important thing about people in my short life: Judge them by their achievements. It doesn’t matter what you know, if you don’t act. Talk is cheap.