Tim Challies has an excellent article that succinctly considers the question of why Christians should read the Bible. He makes the excellent point that there is no explicit verse that commands Christians to read the Bible on a daily basis. So why do we do it? Here’s an excerpt:
When I think about the area of daily Bible study I find my mind drawn to the issue of assurance of salvation—whether or not a Christian can be certain that he is saved. I think I am led this way because the Bible is so central, so integral to the Christian life, that to feel no love for it, no desire to study it, must be a sign of spiritual sickness. I would certainly never say that a person who does not want to study the Bible or who does not enjoy studying the Bible is not a Christian. But I would venture to say that the Christian life is so dependent upon Scripture that a person who has no regard for the Bible and who shows little interest in it would have good reason to seriously consider his salvation. Such a person would do well to examine his soul to see if he really has come to know the Lord.
You can read the whole article here.