While we look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal.
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2 Corinthians 4:16-18
Tyndale Open Study Notes (CC BY-SA 4.0).
4:18 If we look at the troubles we can see now, we grow faint; but when we see our lives in the light of eternal reality, we know that our troubles will soon be gone.
Other Bible passages linked to this one, most cited first.
(For we walk by faith, not by sight:)
For we are saved by hope: but hope that is seen is not hope: for what a man seeth, why doth he yet hope for? But if we hope for that we see not, then do we with patience wait for it.
Now faith is the substance of things hoped for, the evidence of things not seen.
For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world. And the world passeth away, and the lust thereof: but he that doeth the will of God abideth for ever.
And this is the promise that he hath promised us, even eternal life.
These all died in faith, not having received the promises, but having seen them afar off, and were persuaded of them, and embraced them, and confessed that they were strangers and pilgrims on the earth.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.