Wants power and will do anything for it
Basically, this quote means that you should do what's best for you even if the choices you make might hurt someone else. It also states that you need to do things that are in your best interest, even if they hurt and are painful because at the end of the day you are the most important person and you deserve to be happy.
Teiresias blames Creon for the anger of the gods because Creon refused the burial of a dead man and entombed Antigone alive.
I hope this helps!
