“Now I beseech you, brethren, mark them which cause divisions and offences contrary to the doctrine which ye have learned; and avoid them.”
Romans 16:17

The children of the wicked one who disguise themselves as ministers of righteousness have been accurately described by the word of God- they cause division; they distort doctrines in order to draw away sheep to themselves and they are ungodly, following the path of the Pharisees; making those they seek to influence even more ungodly and worldly than themselves.
“Woe unto you, scribes and Pharisees, hypocrites! for ye compass sea and land to make one proselyte, and when he is made, ye make him twofold more the child of hell than yourselves.” Matthew 23:15
They speak seemingly great words but in reality are waterless clouds with absolutely nothing to offer. Read this carefully:
“These are wells without water, clouds that are carried with a tempest; to whom the mist of darkness is reserved for ever. For when they speak great swelling words of vanity, they allure through the lusts of the flesh, through much wantonness, those that were clean escaped from them who live in error. While they promise them liberty, they themselves are the servants of corruption: for of whom a man is overcome, of the same is he brought in bondage. For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning. For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered unto them. But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.” 2 Peter 2:17-22