We are humans oh and as a result our mind thinks out of place at times.
We should try not to think evil at any one, wether our enemies or friends.
Never let anger stay up in you for more than a day because a nortured anger turns into something else, before you know what is going on,your heart Start to conceive evil things.
Lets be guided at all times and let patience envelope you all round.
One may not know this...the evil thoughts coming out of our minds are registered as negative feelings and this cause issues to the mind itself, negative feelings causes ageing, headaches, restlessness and its also called self-made prison.
Free yourself.