Right from the first paragraph of Scripture, we see the Holy Spirit operating along with God's Word. The spoken Word of God and the brooding of the Holy Spirit (Gen.1:3), brought beauty and order out of chaos. That is how God can bring beauty and order into our lives too.
The power of the Holy Spirit known experientially, without the guidance of the written Word would leave a man like a steam engine, full of steam but without any rails to run on. Conversely, knowledge of the written Word without the anointing and the power of the Holy Spirit would make a man like an engine standing on neatly laid-out rails, but lacking the steam to move forward.
God's Word is the means by which we understand the mind of God. Through submitting to it, we can have our minds renewed to think the way God thinks and "to look at things from God's point of view" (Col.1:9- paraphrase). It is impossible to grow spiritually without allowing God's Word to renew our minds.
Many do not know the will of God in the different situations of life, only because they do not know the Word of God. There is an answer in God's Word for every single problem that we can ever face in life - if only we know where to find it.
How poor those believers are who do not know the Word of God.
The Word of God is also a revealer of our inner spiritual condition (Heb.4:12). It is like an scanning machine that reveals everything inside our hearts. One who does not regularly meditate on God's Word will remain perpetually ignorant and self-deceived about his true state.
When it comes to spiritual battle, the Word of God is our weapon against Satan. Jesus overcame Satan only by quoting the Word of God to him (Matt.4:1-10). This is the sword by which the Enemy is driven away. When the Word of God dwells within a person, he becomes strong to overcome all of Satan's schemes (1 Jn.2:14).
We need to hear God's Word speaking to us DAILY, if we are to get light on ourselves, be overcomers, and make spiritual progress.