~But these speak evil of those things which they know not: but what they know naturally, as brute beasts, in those things they corrupt themselves.~
----False Teachers claimed that they possessed secret knowledge that gave them authority. Their "knowledge" of The Most High was esoteric - mystical and beyond human understanding. But The Most High, in His grace, has chosen to reveal himself to us - in His Word, and supremely in Yashayah Ha Mashayahk.
Therefore, we must seek to know all we can about what He has revealed, even though we cannot fully comprehend The Most High with our finite human minds. Beware of those who claim to have all the answers and who belittle what they do not understand.
----Jude offers three examples of men who did whatever they wanted (1.10) - Cain, who murdered his brother out of vengeful jealousy (Genesis 4:1-16); Balaam, who prophesied to get money, not out of obedience to The Most High's command (Numbers 22-24); and Korah, who rebelled against The Most High's divinely appointed leaders, wanting the power for himself (Numbers 16:1-35).
These stories illustrate attitudes that are typical of false teachers - pride, selfishness, jealousy, greed, lust for power, and disregard of The Most High's will.
----KJV -- Life Application Bible----NRSV