To a new believer who asked why daily Bible reading is so essential to a fruitful life:
“I have never met a mature, fruitful, strong, spiritually discerning Christian who is not full of Scripture, devoted to regular meditation on Scripture, and given to storing it in the heart through Bible memorization—and that’s not a coincidence.” Indeed,
“it is absolutely essential, after coming to faith in Christ, to be radically, deeply, experientially devoted—unshakably, unwaveringly persuaded—that reading and meditating on and understanding and memorizing and enjoying the Scriptures is absolutely essential for the Christian life.”
It calls for daily practice.

Here are ten reasons we need the word daily.
(1) Scripture is a means of preserving our salvation. Salvation is a dynamic reality that functions in three tenses: past, present, and future. And in the present reality, “God saves us daily by Scripture” (1 Tim. 4:16).
(2) Scripture meets Satan’s temptations (John 8:44; 1 John 2:14). “Every time Jesus was tempted by the devil, he struck back with ‘the sword of the Spirit, which is the word of God’” (Eph. 6:17).
(3) Scripture is a means of grace and peace to us (2 Pet. 1:2).
(4) Scripture is meant to sanctify our lives, to make us more and more holy (John 17:17). “We don’t become perfect in this life, but we do become holy” through the Spirit’s work in our lives via the word.
(5) Scripture gives us joy (Ps. 1:2; 1 Thess. 1:6). “Life without joy is unbearable. The Christian life is filled with afflictions. But in them all, God sustains joy, and he does it by the Scriptures.”
(6) Scripture protects from error (Eph. 4:13–14). “How do Christians avoid becoming leaves blown around by all the cultural winds of opinions? The answer: ‘The unity of the faith and of the knowledge of the Son of God—knowledge that they experience not as the opinion of man, but as the word of God. That’s found in one place: the scriptures.”
(7) Scripture gives us hope for eternity. Scripture promises us that the frustrations that limit our joy in this life will be removed in the age to come.
(8) Scripture keeps us from being startled by false teachers and apostates (2 Tim. 4:3).
(9) The Bible calls for careful handling, which we can only learn through day-by-day familiarity with the word (2 Tim. 2:15). “The Bible sustains our lives with the word” (Matt. 4:4).
(10) “Spiritual life—eternal life—just like physical life, must be fed, not by bread, but by the word of God. If you think that you have eternal life as a kind of vaccination against hell, which needs no nourishment, you don’t know what spiritual life is.”

Spiritual life is sustained by the daily bread of God’s word.²

Notes:
² APJ 1512: “Ten Reasons to Read the Bible Every Day” (August 14, 2020).