37 If you believe, you shall not only receive remission of sins, but also do things which pass man's power. And may thou be worthy of the gift of prophecy also! For you shall receive grace according to the measure of your capacity and not of my words; for I may possibly speak of but small things, yet you may receive greater; since faith is a large affair. All your life long will your guardian the Comforter abide with you; He will care for you, as for his own soldier; for your goings out, and your comings in, and your plotting foes. And He will give you gifts of grace of every kind, if you grieve Him not by sin; for it is written, And grieve not the Holy Spirit of God, whereby you were sealed unto the day of redemption. What then, beloved, is it to preserve grace? Be ready to receive grace, and when you have received it, cast it not away.
Source: Catechetical Lectures (New Advent)