Charles H. Spurgeon on Psalms 119:15

I will meditate in thy precepts. He who has an inward delight in anything will not long withdraw his mind from it. As the miser often returns to look upon his treasure, so does the devout believer by frequent meditation turn over the priceless wealth which he has discovered in the book of the Lord. To some men meditation is a task; to the man of cleansed way it is a joy. He who has meditated will meditate; he who saith, "I have rejoiced, "is the same who adds, "I will meditate." No spiritual exercise is more profitable to the soul than that of devout meditation; why are many of us so exceeding slack in it? It is worthy of observation that the preceptory part of God's word was David's special subject of meditation, and this was the more natural because the question was still upon his mind as to how a young man should cleanse his way. Practical godliness is vital godliness.

And have respect unto thy ways, that is to say, I will think much about them so as to know what thy ways are; and next; I will think much of them so as to have thy ways in great reverence and high esteem. I will see what thy ways are towards me that I may be filled with reverence, gratitude, and love; and then I will observe what are those ways which thou hast prescribed for me, thy ways in which thou wouldest have me follow thee; these I would watch carefully that I may become obedient, and prove myself to be a true servant of such a Master.

Note how the verses grow more inward as they proceed: from the speech of Psalms 119:13 we advanced to the manifested joy of Psalms 119:14, and now we come to the secret meditation of the happy spirit. The richest graces are those which dwell deepest.