The first part of this chapter is a warning about false teachings introduced by those who have abandoned the faith and are instead following deceitful spirits. Paul instructed Timothy to stand against these men who were distorting the gospel, pointing out their false teaching to the believers in Ephesus.
If you point these things out to the brothers and sisters, you will be a good minister of Christ Jesus, nourished on the truths of the faith and of the good teaching that you have followed.1 Timothy 4:6 NIV
Paul told Timothy that if he pointed out these false teachings, he would be a good servant of Jesus. One who would be helping other believers avoid the trap that these deceiving spirits were laying.
But, to recognize and point out falsehood, the servants of Jesus must themselves be well grounded in the faith. We cannot recognize false doctrine if we do not know what true doctrine looks like.
To be nourished on the truths of the faith and good teaching is more than just something you have done in the past. It is an ongoing activity, feeding on God’s word and godly teaching that conforms to God’s word. If you are actively spending time in God’s word and being nourished by it, you will be able to recognize falsehood and help others avoid it. And you will be a good servant of the Lord Jesus.
Read your Bible. Not just on Sunday morning. And not just casually. But regularly feed on it. Take the time to allow its truths to nourish your inner being so that you can grow in your faith and usefulness to our Lord.