Proverbs 27 KJV

Iron sharpens iron, thus the strength of one can strengthen others. God gives us these strengths not for our self's to over power others, but to help others overcome their weaknesses. When we give into our own desires is when weak men become conniving, deceitful, and lie to themselves and others to get what they want.
Judas is a perfect example and lied to himself and betrayed the Lord for the weaknesses that laid in his own soul. A strong my looks at his weaknesses and excepts his own faults, but a weak man will persist to deny any possibility of their own blind spots. After acknowledging the fault, a strong man will seek out how to fix it. The weak man will only begin to see ways he can change his morality to make his morals match his failure to line his actions up with his previous value of integrity.
Each type of man develops slowly, day by day, inch by inch, but only one way goes up, and the other down to Hell.