"Thy word have I hid in mine heart, that I might not sin against thee." (Psalm:119:11Thy word have I hid in mine heart, that I might not sin against thee.
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The memorizing of Scripture has become almost a lost art among Christians today, and it is a great loss, for storing Scripture in the heart can be a great blessing in one's Christian life and witness.
 
The example of the early Christians is clear: Peter, Stephen, Paul, and others quoted extensively from the Old Testament in their impromptu sermons (Acts:2:17-21 [17] And it shall come to pass in the last days, saith God, I will pour out of my Spirit upon all flesh: and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall dream dreams: [18] And on my servants and on my handmaidens I will pour out in those days of my Spirit; and they shall prophesy: [19] And I will shew wonders in heaven above, and signs in the earth beneath; blood, and fire, and vapour of smoke: [20] The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the LORD come: [21] And it shall come to pass, that whosoever shall call on the name of the Lord shall be saved.
See All... [2]; 7:32-34; 13:33-35; etc.), and the same has been true of most of the great preachers and teachers of the Word ever since. There are multitudes of situations where it is of great help to be able to cite from memory an appropriate Scripture passage.
 
But the main reason for memorizing Scripture is the Word itself in effect commands it: "Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord" (Colossians:3:16Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord.
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The Lord Jesus Himself, in His humanity, no doubt learned the Scriptures as a boy (Luke:2:47And all that heard him were astonished at his understanding and answers.
See All... [4], 52) and then quoted from them extensively in His many discourses, "leaving us an example, that ye should follow his steps" (1 Peter:2:21For even hereunto were ye called: because Christ also suffered for us, leaving us an example, that ye should follow his steps:
See All... [5]). He provided a perfect illustration of the validity of our text, defeating Satan in each of his three temptations simply by quoting a Scripture verse that He had long before hidden in His heart (Matthew:4:4But he answered and said, It is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God.
See All... [6], 7, 10). For the Word truly to be in our lives, it needs to be in our hearts.
--Henry M. Morris