The kingdom of heaven is likened unto a man which sowed good seed in his field: but while men slept, his enemy came and sowed tares among the wheat, and went his way. Matt. 13:24, 25.
When the seed that was sown in this parable came up, the servants of the householder noticed that there were tares among the wheat. They came to their employer and said, "Sir, didst not thou sow good seed in thy field? from whence then hath it tares?" He recognized immediately the work of an enemy. But he did not respond as his servants expected, and ask them to root out all the tares. He told them instead to let them both grow together until the time of harvest. Then they would be able to tell the wheat and tares apart without mistake, and could safely separate them.
This parable of Jesus is about the judgment. In the field of the world, which God had planted with good, an enemy came in and brought evil. The time of judgment is the time when the final separation between good and evil will be made.
One thing this parable shows us concerning what Jesus is like is that the wheat and tares are both allowed time to develop. They are both allowed time to make fully manifest, to themselves and to the rest of the world, what their character really is.
The servants could recognize the presence of weeds, of tares, in the field even from the beginning. But they did not have the insight to judge correctly in every case. So it is in the universe. The unfallen angels, and the rest of the watching creation, were able to see that there were problems when Satan was cast out of heaven. But in order for there to be no question as to which was wheat and which was tares, God allows them both to develop fully, so that their quality will be fully manifested. At the time that both good and evil are mature, there will be no question for any as to which is which, and as to the character and value of either.
Following the judgment, when the wheat and tares are identified because of their unquestionable character, the rewards of each are given. The tares are bound in bundles to be burned. But the wheat is gathered into the barn. The judgment reveals to all the universe the fairness and rightness of God, as well as His mercy, in allowing every opportunity for repentance.