God Commands it!
"Fix these words of mine in your hearts and minds; tie them as symbols on your hands and bind them on your foreheads. Teach them to your children, talking about them when you sit at home and when you walk along the road, when you lie down and when you get up. Write them on the doorframes of your houses and on your gates, so that your days and the days of your children may be many in the land that the LORD swore to give your forefathers, as many as the days that the heavens are above the earth" (Deuteronomy 11:18-21).
"Let the word of Christ dwell in you richly as you teach and admonish one another with all wisdom, and as you sing psalms, hymns and spiritual songs with gratitude in your hearts to God" (Colossians 3:16).
"Do your best to present yourself to God as one approved, a workman who does not need to be ashamed and who correctly handles the word of truth" (2 Timothy 2:15).
"Now the Bereans were of more noble character than the Thessalonians, for they received the message with great eagerness and examined the Scriptures every day to see if what Paul said was true" (Acts 17:11).
"These commandments that I give you today are to be upon your hearts" (Deuteronomy 6:6).
"For everything that was written in the past was written to teach us, so that through endurance and the encouragement of the Scriptures we might have hope." (Romans 15:4).
"These things happened to them as examples and were written down as warnings for us, on whom the fulfillment of the ages has come" (1 Corinthians 10:11).
"I delight in your decrees; I will not neglect your word" (Psalm 119:16).
"Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me" (John 5:39).
"Look in the scroll of the LORD and read" (Isaiah 34:16).