I will meditate...

From the additional notes to Charles Spurgeon's The Treasury of David, Psalm 119 verse 15



Ver. 15. I will meditate on thy precepts.
See this "I will" repeated again and again (Psalms 119:48; Psalms 119:78). In meditation it is hard (sometimes at least) to take off our thoughts from the pre-engagements of other subjects, and apply them to the duty. But it is harder to become duly serious in acting in it, harder yet to dive and ponder; and hardest of all to continue in an abode of thoughts, and dwell long enough, and after views to make reviews, to react the same thinking, to taste things over and over, when the freshness and newness is past, when by long thinking the things before us seem old. We are ready to grow dead and flat in a performance except we stir up ourselves often in it. It is hard to hold on and hold up, unless we hold up a wakeful eye, a warm affection, a strong and quick repeated resolution; yea, and without often lifting up the soul to Christ for fresh recruits of strength to hold on. David, that so excellent artist in this way, saith he will meditate, he often saith he will. Doubtless, he not only said "I will" when he was to make his entrance into this hard work; but likewise for continuance in it, to keep up his heart from flagging, till he well ended his work. It is not the digging into the golden mine, but the digging long, that finds and fetches up the treasure. It is not the diving into the sea, but staying longer, that gets the greater quantity of pearls. To draw out the golden thread of meditation to its due length till the spiritual ends be attained, this is a rare and happy attainment. Nathanael Ranew, 1670.

and also: 

Meditation is of that happy influence, it makes the mind wise, the affections warm, the soul fat and flourishing, and the conversation greatly fruitful. Nathanael Ranew.

Another reason why it's good to memorise Scripture!

Fixed duty

From the additional notes to Charles Spurgeon's The Treasury of David; notes on Psalm 108. 

Verse 1. Meditation is a fixed duty. It is not a cursory work. Man's thoughts naturally labour with a great inconsistency; but meditation chains them, and fastens them upon some spiritual object. The soul when it meditates lays a command on itself, that the thoughts which are otherwise flitting and feathery should fix upon its object; and so this duty is very advantageous. As we know a garden which is watered with sudden showers is more uncertain in its fruit than when it is refreshed with a constant stream; so when our thoughts are sometimes on good things, and then run off; when they only take a glance of a holy object, and then flit away, there is not so much fruit brought into the soul. In meditation, then, there must be a fixing of the heart upon the object, a steeping the thoughts, as holy David: "O God, my heart is fixed." We must view the holy object presented by meditation, as a limner who views some curious piece, and carefully heeds every shade, every line and colour; as the Virgin Mary kept all these things, and pondered them in her heart. Indeed; meditation is not only the busying the thoughts, but the centring of them; not only the employing of them, but the staking them down upon some spiritual affair. When the soul, meditating upon something divine, saith as the disciples in the transfiguration (Mt 17:4), "It is good to be here."—John Wells, in the "Practical Sabbatarian," 1668.