In Srimad Bhagavatam in ninth canto, there is a story of Cyavana muni. He was very powerful yogi. Millions of time more powerful than any materialist today in his ability to fulfill his material desires. He had attained very great mystic powers. And of course when one becomes very powerful spiritually or materially, the tendency is to become very proud and in pride the greatest danger is that we can offend saintly persons.