Like newborn infants, long for the pure spiritual milk, that by it you may grow up into salvation—if indeed you have tasted that the Lord is good.
(1 Peter 2:2-3 ESV)
I've used this illustration so many times about longing for the Word as babies long for milk. And it's a great picture! But reading William Tyndale recently highlighted the verse that's attached - "if indeed you have tasted that the Lord is good."
I think what this verse is saying is that when we have indeed experienced the goodness of God and the good effects of the Bible as it leads us closer to Him and we are filled with His Spirit; we will long to be continually in His Word.