Hebrews 5:14 GW However, solid food is for mature people, whose minds are trained by practice to know the difference between good and evil.
How do we know right from wrong? By knowing Jesus, by communicating with and listening to Him. By diligently reading and studying what He has to say in His Word--the Bible.
If we're not regularly reading God's Word, we're going to struggle with knowing truth from error, right from wrong, good from evil. If we're not regularly reading God's Word, we'll be much easier led astray.
Maturity comes from growing in Christ. Do I have the commitment and courage to really know Him, study His Word and live by His principles—and not my idea of what those are?