Colossians 1:9

Colossians 1:9. For this cause we also, since the day we heard it, do not cease to pray for you, and to desire that ye might be filled with the knowledge of his will in all wisdom and spiritual understanding;

If you have the graces of the Spirit, it is important that they should be deepened, that they should grow through being fed with divine nourishment. What the water is to the plant, making it further to develop itself, that is the knowledge of God’s will to our gifts and graces; they grow and become fruitful through an increase in the knowledge of God.