St. Thomas A Kempis, in Imitation of Christ, warns of a similar false security, that of thinking that knowing the Catholic faith well is the same as living the Catholic life:
What good does it do to speak learnedly about the Trinity if, lacking humility, you displease the Trinity? Indeed it is not learning that makes a man holy and just, but a virtuous life makes him pleasing to God. I would rather feel contrition than know how to define it.
For what would it profit us to know the whole Bible by heart and the principles of all the philosophers if we live without grace and the love of God? Vanity of vanities and all is vanity, except to love God and serve Him alone.
This is the greatest wisdom--to seek the kingdom of heaven through contempt of the world.
So as we today mark the halfway point between Ash Wednesday and Easter Sunday, let us redouble our fasting and abstinence, prayer and almsgiving, and continue to seek a deeper understanding of our faith from Scripture and the testimony of the Church and Her Saints. But let us not mistake any of these things for the purpose of Lent, or become proud of our own efforts. Instead, let these all be tools to aide us in our question for true devotion, "to love God and serve Him alone."