"He is like a tree [trans]planted by streams of water that yields its fruit in its season, and its leaf does not wither.  In all that he does, he prospers" (Psalm 1:3).
Psalm 1 is all about delighting in the Bible. We don't always feel like reading it - just as we don't always feel like eating healthily - but still we need it nonetheless because it's essential for our healthy growth.  Because God’s intended means to nourish, grow and exercise our faith is His Spirit inspired Word.  Let’s develop the Psalm's picture of the tree for us as Christians: In the past we were out dying in the desert separated from the God of life by our sin, but now through faith in the gospel we have been "transplanted" into Christ, indwelt by the nourishing "living water" of the Holy Spirit.  We need to have our roots in place absorb the nutrients on offer, if we’re to grow up and bear fruit.  Those vital roots are reading God’s Word, responding to what He has said by praying to God our heavenly Father, and meeting with God’s people for mutual encouragement.  When we are doing these things in faith they become channels for God’s grace to be working in us by the Holy Spirit.  He will then increasingly help us to grow in spiritual health and stability.  And He will produce through us the fruit of a changed life and a changed world through us.  If we wanted to get better at our sport…our instrument… our job…we put in time and effort and discipline to develop and grow.  How much more is that principle true for our spiritual development: it will require us to invest time and effort into meditating on the Word of God, so He can use it to make us grow and bear fruit for Him.