Joshua was the great leader of the children of Israel as they entered and conquered the promised land. They took possession of all that God had promised was theirs. Battles had to be fought and won, but the land was theirs for the taking.
In the run up to their crossing the Jordan and beginning the battle God spoke to Joshua. In Joshua 1 verse 8 God commands Joshua not only to be strong and courageous, but to keep His word and meditate on it. This was what would make Joshua prosper in the path that he was taking.
So it is with us. Nothing will prosper us more in our spiritual lives than keeping and meditating on God’s word! It is not just reading, not the daily portion for the sake of being able to say that we have done it, but rather the seeking to know and understand and the reading prayerfully before the Lord. It is the constant keeping (cf. Deut. 6:4-9) of God’s word before us and our families that will bless us. It is this that will make us fruitful people in the Lord (Psalm 1).