Alexander Maclaren on Psalm 16:5-6:

No man who takes the world for his portion ever said, ‘The lines are fallen to me in pleasant places.’ For the make of your soul as plainly cries out ‘God!’ as a fish’s fins declare that the sea is its element, or a bird’s wings mark it out as meant to soar. Man and God fit each other like the two halves of a tally. You will never get rest nor satisfaction, and you will never be able to look at the past with thankfulness, nor at the present with repose, nor into the future with hope, unless you can say, ‘God is the strength of my heart, and my portion for ever.’ But oh! if you do, then you have a goodly heritage, a heritage of still satisfaction, a heritage which suits, and gratifies, and expands all the powers of a man’s nature, and makes him ever capable of larger and larger possession of a God who ever gives more than we can receive, that the overplus may draw us to further desire, and the further desire may more fully be satisfied.

Expositions of Holy Scripture, VOLUME I: PSALMS I to XLIX