Something that just came to me: It has to do with a seed sprouting into a plant. When a seed is planted in the ground first it puts down roots to get to the water and then it sprouts above ground to receive sunlight. Just like this when we receive the Kingdom (by believing) the seed of the Kingdom is planted in us and first we put down roots to get to the living water, then we sprout above ground to receive the light of God (the truth). We must receive the living water first to get us going (like how we start off with the milk of the word and then move on to the meat when we are ready), then after this we must receive the truth (the light) to grow in God.