Charles Spurgeon Commentary Matthew 13:47-50

"Again, the kingdom of heaven is like unto a net, that was cast into the sea, and gathered of every kind: which, when it was filled, they drew up on the beach; and they sat down, and gathered the good into vessels, but the bad they cast away. So shall it be in the end of the world: the angels shall come forth, and sever the wicked from among the righteous, and shall cast them into the furnace of fire: there shall be the weeping and the gnashing of teeth." — Matthew 13:47-50 (ASV)

Again, the kingdom of heaven is like unto a net, that was cast into the sea, and gathered of every kind: Which, when it was full, they drew to shore, and sat down, and gathered the good into vessels, but cast the bad away. So shall it be at the end of the world: the angels shall come forth, and sever the wicked from among the just, And shall cast them into the furnace of fire: there shall be wailing and gnashing of teeth.

We are to cast the great seine-net of the gospel into the sea of humanity, but we must not expect that all we catch will prove to be good. There is a time of separation coming when the angels shall come forth, and sever the wicked from among the just.