If you want to judge how well a person understands Christianity, find out how much he makes of the thought of being God's child, and having God as his Father. If this is not the thought that prompts and controls his worship and prayers and his whole outlook on life, it means that he does not understand Christianity very well at all.
J. I. PackerWhat makes life worthwhile is having a big enough objective, something which catches our imagination and lays hold of our allegiance, and this the Christian has in a way that no other person has. For what higher, more exalted, and more compelling goal can there be than to know God?
J. I. PackerIt has been said that in the New Testament doctrine is grace; and ethics is gratitude; and something is wrong with any form of Christianity in which, experimentally and practically, this saying is not being verified. Those who suppose that the doctrine of God's grace tends to encourage moral laxity are simply showing that, in the most literal sense, they do not know what they are talking about. For love awakens love in return; and love, once awakened, desires to give pleasure.
J. I. Packer