In short, if you do not stabilize (heng 恆) than an act of virtue (te 德) can bring evil.
What is also interesting is that in my Shamanic training I was informed that, "you must stabilize your personality before you step into power. Because when you have access to power it will manifest in accordance to your personality."
I will confirm this with my own experience because I opened my ability to "see" very young and because I was so immature within my personality it most certainly did bring "evil and disgrace".
At least to me this reconfirms my enduring sentiment that the study and training of 恆德 heng te, stable virtue, should supersede and precede any attempts for mystical powers.
Via Jerónimo M.M.