From "A Word about Praise" in C.S. Lewis's Reflections on the Psalms:

But the most obvious fact about praise - whether of God or anything - strangely escaped me. I thought of it in terms of compliment, approval, or the giving of honor. I had never noticed that all enjoyment spontaneously overflows into praise unless shyness or the fear of boring others is deliberately brought in to check it. The world rings with praise - lovers praising their mistresses, readers their favorite poet, walkers praising the countryside, players praising their favorite game - praise of weather, wines, dishes, actors, motors, horses, colleges, countries, historical personages, children, flowers, mountains, rare stamps, rare beetles, even sometimes politicians of scholars. I had not noticed how the humblest, and at the same time most balanced and capacious, minds praised most, while the cranks, misfits and malcontents praised least...
I had not noticed either that just as men spontaneously praise whatever they value, so they spontaneously urge us to join them in praising it: "Isn't she lovely? Wasn't it glorious? Don't you think that magnificent?" The Psalmists in telling everyone to praise God are doing what all men do when they speak of what they care about.
I think we delight to praise what we enjoy because the praise not merely expresses but completes the enjoyment; it is its appointed consummation. It is not out of compliment that lovers keep on telling one another how beautiful they are; the delight is incomplete till it is expressed.