The tell tale heart

It is an amazing paradox, the heart. From it issues forth beauty and love, contentment and happiness, but equally so it has the power to spew forth hatred and malice, anger and covetousness. Humanity encapsulates a beautiful contradiction. How are we to reconcile such phrases as, "the heart is deceitful above all things, who can know it?" and "guard your heart with all diligence, for out of it flow the issues of life." It is both beautiful and repulsive, capable of the most intimate, self-sacrificing love, and conversely able to experience the most vehement hatred imaginable. We are indeed a contradiction in terms...