The awareness of the ambiguity of one's highest achievements (as well as one's deepest failures) is a definite symptom of maturity.
Being religious means asking passionately the question of the meaning of our existence and being willing to receive answers, even if the answers hurt.
Our language has wisely sensed the two sides of being alone. It has created the word loneliness to express the pain of being alone. And it has created the word solitude to express the glory of being alone.