Musar su Zaccaria 13:78

There is a modesty which is as evil as arrogance, as in the case of the false prophets who used to dress in the humble garments of the prophets of truth in order that people should accept their lies and falsehoods, as it is said: "Neither shall they wear a hairy mantle to deceive" (Zech. 13:4).

We have previously discussed the fact that anyone whose soul, נשמה, is rooted in the very highest regions of the Celestial Spheres, in the עולם האצילות, can never be the cause of sin. If however, his soul is only on the level of רוח, then he may become the source of sin through the seduction of the serpent which was affected by the spirit of envy, which in turn brings in its wake the spirit of טומאה, impurity. King David constantly begged that the Holy Spirit, רוח הקדושה, as well as the spirit of wisdom and understanding may inhabit him, and that the prophecy of Zachariah 13,2, where G–d says "I will remove the spirit of impurity from Earth," be fulfilled in the future.