“For we walk by faith, not by sight”
~ 2 Corinthians 5:7
The people of this world are influenced by the things that are seen. They live for wealth, honor, splendor, praise, for the objects which this world can furnish, and as if there were nothing which is unseen, or as if they ought not to be influenced by the things which are unseen. The Christian, on the contrary, has a firm conviction of the reality of the glories of heaven; of the fact that the Redeemer is there; of the fact that there is a crown of glory; and he lives, and acts as if that were all real, and as if he saw it all.
God is unseen – but the Christian lives, and thinks, and acts as if there were a God, and as if he saw him. Christ is unseen now by the bodily eye; but the Christian lives and acts as if he were seen, that is, as if his eye were known to be upon us, and as if he was now exalted to heaven and was the only Saviour. The Holy Spirit is unseen; but he lives, and acts as if there were such a Spirit, and as if his influences were needful to renew, and purify the soul. Heaven is unseen; but the Christian lives, and thinks, and acts as if there were a heaven, and as if he now saw its glories. He has confidence in these, and in kindred truths, and he acts as if they were real. Could man see all these; were they visible to the naked eye as they are to the eye of faith, no one would doubt the propriety of living and acting with reference to them.
~ Albert Barnes, Barnes’ Notes on the Whole Bible
A Prayer Life 