Philippians 1:9,10 “And this I pray, that your love may abound yet more and more in knowledge and in all judgment; That ye may approve things that are excellent; that ye may be sincere and without offence till the day of Christ;”
Paul often prayed that the people he wrote to in his letters would grow spiritually. The need for spiritual growth is needed just as much today.
Sadly, many believers stay spiritual babies most of their lives. Part of the reason is that they do not get into an atmosphere where growth is possible. They do not read their Bible or go to church very often. Or, if they do go, the messages and lessons are not applied. Growing spiritually requires much more than gaining mere head knowledge about the Bible.
Paul hit the nail on the head when he said that spiritual growth requires being able to discern between the things that are excellent – those that God approves of – and those that He disapproves of. Once those things are understood – do them with His help.
These things can be found in the Bible and by listening to the Holy Spirit. The key to hearing Him lies in spending time with Him reading and studying the Bible, praying, and obeying what you know. When sins are committed, confess them quickly, thank Him for it, and move on.