I am not a catholic, but even our Lord said that a believer in Him is one who hears and does His teachings. Not somebody who just hears.
John 14:15
"If you love Me, you will keep My commandments.
John 14:24
Whoever does not love me does not keep my words. And the word that you hear is not mine but the Father’s who sent me.
Luke 6:46-49
And why call ye me, Lord, Lord, and do not the things which I say? Whosoever cometh to me, and heareth my sayings, and doeth them, I will shew you to whom he is like: He is like a man which built an house, and digged deep, and laid the foundation on a rock: and when the flood arose, the stream beat vehemently upon that house, and could not shake it: for it was founded upon a rock. But he that heareth, and doeth not, is like a man that without a foundation built an house upon the earth; against which the stream did beat vehemently, and immediately it fell; and the ruin of that house was great.
Then Paul in his epistle to Titus confirms this;
Titus 1:16
They profess that they know God; but in works they deny him, being abominable, and disobedient, and unto every good work reprobate