“So then, you will know them by their fruits.” (NASB)
STRONGS HEBREW/GREEK ORIGINS
“So then, you will know (epiginosko: recognize, acknowledge, perceive, have knowledge of, to become thoroughly acquainted with - by sight, hearing, of certain signs) them by their fruits (karpos: that which originates or comes from something, an effect, a result).”
So then, you will be able to perceive and evaluate them according to the results that their life produces.
Jesus told us plain and simply how to discern the true Believer from the false. He stated in black and white terms, good will produce good and bad will produce bad. I believe that is critical in this hour to surround yourself with true Believers, ones that are found to be producing good fruit. Become thoroughly acquainted with their ways, watch them, know them - wisely perceive who you share your life with. Also, do all that you can today to be found as one producing good fruit that will last, as defined by the Word.