It's true to say that, and what I mean to help understand by quoting Albert Einstein is just like the fish that can't climb a tree, we should not imitiate and emulate others by trying to live life like others do. Rather, we should stick to what we are great at and grow our skills and knowledge as widely as we can in the field of choice. Otherwise, it would be the equivalent of a pilot trying to be a surgeon, or a doctor trying to be a lawyer (or a fish climbing a tree)