14 Knowing this, therefore, let us walk spiritually, that we may be counted worthy of God's adoption. For as many as are led by the Spirit of God, they are the sons of God. For it profits us nothing to have gained the title of Christians, unless the works also follow; lest to us also it be said, If you were Abraham's children, you would do the works of Abraham. For if we call on Him as Father, who without respect of persons judges according to every man's work, let us pass the time of our sojourning here in fear, loving not the world, neither the things that are in the world: for if any man love the world, the love of the Father is not in him. Wherefore, my beloved children, let us by our works offer glory to our Father which is in heaven, that they may see our good works, and glorify our Father which is in heaven. Let us cast all our care upon Him, for our Father knows what things we have need of.
Source: Catechetical Lectures (New Advent)