Can a person feel the five senses at the same time? He can, but can't if he tries to. When a person put all his energy into something, doesn't that mean that the person will have to ignore the rest. And if he ignores it, he will be sacrificing it, and he will never know what he will be sacrificing. If a person wants to be the best, or to be perfect, he cannot sacrifice the other things to concentrate on something.
Is there a difference between sacrificing something in order to get something out of something, and sacrificing something in order to not learn something?
When you don't learn something, you don't need to risk into doing something wrong into that new world. The world you are now is secure, and you don't want to leave it, otherwise you could make mistakes.
And what is the problem with making mistakes? Maybe the people who makes the most mistakes are the people who risk the most, and at the same time are the people who are the most happy with themselves and their lives.