Consider three things, and you will not approach sin. Know whence you came, whereto you are going, and before Whom you are destined to give an accounting (Ethics of the Fathers 3:1).
If we thought about our humble origin on the one hand, and the greatness we can achieve on the other, we would come to only one logical conclusion: the potential for such greatness could not possibly reside in the microscopic germ-cell from which we originated. This capacity for greatness can reside only in the neshamah (soul), the spirit which God instills within man.
What an extraordinary stretching of the imagination it must take to think that a single cell can develop into the grandeur which a human being can achieve! People have the power to contemplate and reflect upon infinity and eternity, concepts which are totally beyond the realm of the physical world. How could something purely finite even conceive of infinity?
Our humble origins are the greatest testimony to the presence of a Divine component within man. Once we realize this truth, we are unlikely to contaminate ourselves by behavior beneath our dignity. We have an innate resistance to ruining what we recognize to be precious and beautiful. We must realize that this is indeed what we are.