God spreads His Word liberally among the world's people. Besides God's direct involvement in converting people, the difference between one growing in it and another "dying on the vine" is the soil in which the Word is planted, explained in Jesus' Parable of the Sower.
Bible students do not often consider Christ's parables to contain intrigue, but His Parable of the Wheat and the Tares has its share!
The primary lesson of the Parable of the Wheat and Tares is relatively easy to see. However, an interesting detail appears in it that is easily overlooked.
The Bible, in both parables and prophecies, interprets itself and remains consistent in its use of symbols. We cannot arbitrarily attach meaning to symbols.
We should not expect brethren to be perfect; we all sin. God has not given His People the prerogative to judge another member as a tare.
The letters to the seven churches of Revelation warn of losing our first love, heeding false teachers, compromising God's Truth, and forgetting right doctrine.