A good tree cannot bear bad fruit, and a bad tree cannot bear good fruit. Every tree that does not bear good fruit is cut down and thrown into the fire. Thus, by their fruit you will recognize them. Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but only he who does the will of my Father who is in heaven. Many will say to me on that day, ‘Lord, Lord, did we not prophesy in your name, and in your name drive out demons and perform many miracles?’ Then I will tell them plainly, ‘I never knew you. Away from me, you evildoers! ’ Matthew 7: 18-23

In the above passage, the Lord Jesus made reference to false prophets and disclosed the point that we would recognize them by their fruit. It is sobering to note that calling the Lord Jesus ‘Lord’ and carrying out deeds like prophesying in His name, casting out demons and performing miracles in themselves do not necessarily mean that the doers of such deeds are acceptable and pleasing to God. It is not these outward deeds in themselves, impressive though they may appear to be, but the actual good fruit that the Lord seeks in His servants. For the good fruit must come from a good tree and only one who does the will of God qualifies to be a ‘good tree’. Only children of God who are in a pleasing relationship with the triune God can produce good fruit which will last.

from livinginthelastdays.com