Every Christian is "a letter from Christ" to the world, "written not with ink, but with the Spirit of the living God," written, "not on stone tablets but in their living hearts." (2 Cor. 3:2-3)
No Christian needs to feel lonely or useless. He does not look for applause and approval. The realization of bearing within his very soul the Divine Indwelling of Father, Son and Holy Spirit makes each one a powerful tool for the salvation of the world. Each Christian is a powerhouse of grace reaching out and touching a neighbor by example and prayer. He is powerful no matter where he is or what he does, for the power he possesses is not his own, but the Power of Him who dwells within and in whom he "lives and moves and has his being."
We are part of the Body of Christ on earth and we affect that Body by everything we do and everything we are.
A broken heart fills that Body with a throbbing loneliness. A smile makes it happy. A joy makes it thrill and a pain makes it cry.