Psalm 1:2 speaks of delighting in God's word. I'll give some reasons we should delight in God's word.
1) Psalm 119:9 - Our way is cleansed by taking heed to it
2) Psalm 119:11 – The word keeps us from sinning
3) John 17:17 – Were sanctified by the word
4) 2 Timothy 2:7 – We reflect on the word and the Lord will give us understanding in all things
5) Hebrews 5:12-14 – Skill in the word results in maturity and being able to discern both good and evil
6) 1 Peter 2:2 – We desire the word so that we may grow