Isn't there a verse about weeds mixed with wheat?
Matthew 13:24-30 (NIV)
The Parable of the Weeds
Jesus told them another parable: "The kingdom of heaven is like a man who sowed good seed in his field. But while everyone was sleeping, his enemy came and sowed weeds among the wheat, and went away. When the wheat sprouted and formed heads, then the weeds also appeared.
"The owner's servants came to him and said, 'Sir, didn't you sow good seed in your field? Where then did the weeds come from?'
" 'An enemy did this,' he replied.
"The servants asked him, 'Do you want us to go and pull them up?'
" 'No,' he answered, 'because while you are pulling the weeds, you may root up the wheat with them. Let both grow together until the harvest. At that time I will tell the harvesters: First collect the weeds and tie them in bundles to be burned; then gather the wheat and bring it into my barn.' "
So it's not our job to get rid of the weeds? Jesus wants us to leave that task for Him?
Is it possible that some wheat is harmed when we try to get rid of the weeds ourselves? I think that is what the parable suggests.
(Thanks Al for this reminder.)