How do we know about the elect in the parable of the wheat and tares?

In this parable, the wheat symbolizes those who are the elect, chosen children of God. The distinction is made clear in Matthew 13:38, where it states that the good seed are the children of the kingdom. Their election is revealed through their faith in Jesus Christ, as articulated in 1 Thessalonians 1:4-5, which indicates that the election of God is known through the reception of the gospel in power and the Holy Spirit. It is God's grace that transforms them, allowing them to be recognized as His children, by His sovereign choice.