The parable of the wheat and tares continues with the same subject matter introduced in the previous parable, the parable of the sower. Christ gave these first four parables" out of the house", and down by the seaside.[Matt.13:1].
The parable of the wheat and tares centers around those bearing fruit from the previous parable in order to reveal the method of Saten's attack against them. In this respect, this parable moves a step beyond that revealed at the end of the parable of the Sower. This parable continues with the same thought but then reveals a concentrated attack against those individuals bearing fruit. It reveals the exact method which Satan uses as he goes about seeking to stop that which is occurring.
Satan seeks to prevent fruit-bearing through a number of means revealed in the first three parts of the parable of the sower. And throughout the dispensation, he has been successful in his confrontation with the vast majority of Christians. He has succeeded in preventing most from bearing fruit.
But the preceding has not been true of all Christians. Many have been victorious over Satan's methods and schemes. They have overcome the World, the Flesh, and the Devil. And, as a result, they have brought forth and continue to bring forth fruit. And it is these Christians, the ones bearing fruit, that Satan is seen directing his attack against in the parable of the wheat and tares, seeking to stop that which is occurring.