“Let every thing that hath breath praise the LORD. Praise ye the LORD.” (Psalm 150:6)

…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 honour. 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 [Romeo praising Juliet and vice versa], readers their favourite poet, walkers praising the countryside, players praising their favourite game — praise of weather, wines, dishes, actors, motors, horses, colleges, countries, historical personages, children, flowers, mountains, rare stamps, rare beetles, even sometimes politicians or scholars. . . . Except where intolerably adverse circumstances interfere, praise almost seems to be inner health made audible. . . . 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. 

My whole, more general, difficulty about the praise of God depended on my absurdly denying to us, as regards the supremely Valuable, what we delight to do, what indeed we can’t help doing, about everything else we value.

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. It is frustrating to have discovered a new author and not to be able to tell anyone how good he is; to come suddenly, at the turn of the road, upon some mountain valley of unexpected grandeur and then to have to keep silent because the people with you care for it no more than for a tin can in the ditch; to hear a good joke and find no one to share it with.

From Reflections on the Psalms by C. S. Lewis