Seven Deadly Sins - Pride
What it is: Pride is excessive belief in one's own abilities, that interferes with the individual's recognition of the grace of God. It has been called the sin from which all others arise. Pride is also known as Vanity.
Why you do it: Well-meaning elementary school teachers told you to "believe in yourself."
Your punishment in Hell will be: You'll be broken on the wheel.
Associated symbols & suchlike: Pride is linked with the horse and the color violet.