One of the ways in which surrendering to Christ is termed is coming to know Him. It is the same to say I know the Lord, as it is to say I am born again, or to say I am saved. Equally, when asking someone if they are a Christian, one can ask do you know the Lord?
But for us who do know Him, there is the question, how well? When we are introduced to someone we can say we know them, but the deepness of that relationship is dependent on how much time we spend with them, and getting to know them better.
With Jesus, how do we get to know Him better? By studying and reading His Word! So there is a necessity in being in the Word daily. We can say we know Jesus if we are Christians (that is if we have repented and put our faith in Him), but to know Him well - we must look on Him and listen to Him through Scripture.