To say "I'm only human" as justification for something that you shouldn't have done is like saying, "it's just a dog" when the dog chews up your favorite shoes. No, you train the dog to go against it's natural tendencies and you train it to be better. That's what you have to do for yourself. Train your thoughts and your actions to be only positive, to be pure, be genuine. Learn and apply your knowledge to better yourself constantly.