Imam Ali (AS) said:

If the truth and the falsehood had not been mixed, and the truth had not been hidden from the seekers of the truth, and if the truth and the falsehood had been separated from each other, the tongues of the enemy would have been cut. But they take a part of the truth and a part of the falsehood and mix them together. And that is when Satan dominates his friends and only those who are granted God’s Mercy and Blessing will be saved [1].

[1] Nahjul Balaghah, Sermon 50.

Source: en.shafaqna.com