Growing leaders grow leaders. Great leaders understand that they must grow to continue moving their family or organization forward. With that said, growth is not an automatic process. Learning must be planned with intential effort and then we must apply what we learn to make it stick. Dale Carnegie said, "Learning is an active process. We learn by doing. Only knowledge that is used sticks in your mind."
It's easy & comfortable to stagnate into an insignificant existence, however, that's not what great leaders do. They are intentional with their growth, because they know that if they are not growing, they are mentally dying. Leaders cannot create something that they are not. If they're stale, that can only lead to a stale organization. A growth mindset encourages new ideas, new ways of thinking and a pursuit of keeping oneself relevant.
Martin Luther King Jr, finishes this out well. He said, "The soft minded man always fears change. He feels security in the status quo, and he has an almost morbid fear of the new. For him, the greatest pain is the pain of a new idea."
Remember, growing leaders grow leaders.