What is it that impels a person to commmit sin,even involuntarily?

It is because of the working of his vasanas. Vasanas come from habit. A habit is formed when people keep repeating some actions. A repeated action becomes a habit, and vasanas arise from habit. These vasanas are like recorded discs inside your unconscious. Of course, it is possible to be freed from a vasana, but it takes a lot of strong will and effort to change a habit that has been cultivated over a period of time. Say for example, you take a certain route to office every day. One day, you need to go to a different place that is nearer the office but just a different turning in the last lap. Most of us end up going the office way unless we are conscious of the fact that we have to act differently. This is due to habit. When the conscience warns us the first time a bad action is made, if it is not corrected, slowly the conscience loses its voice and we have to really make a great effort to change the habit. This vasana can be slowly controlled by consciously making an effort to cultivate the opposite habit. If we think we are too short-tempered, instead of trying to control the temper, try and cultivate patience. Automatically, temper will be controlled. When we cultivate the opposite vasana, a previous vasana can be destroyed.

EVERYbody wants to be great in the life but all man cannot become great .some become great by their deeds and hard working but some feel jealous from other and want to be poular /great without doing any thing for society .they have high ambition but no ability to be great they chose the wrong path of life which leades to sin .if a man want to be rich in a one day then he will have to broke the house of other which is sin/ crime .he know that theft is crime but he do so even voluntrily.in the same way the student want to top without studying with the help of unfair mean . it is thinking of the man which force him to commit sin though he knows that is wrong .

I think it is human nature to err, then realize the mistake and seek forgiveness. But of course, one should abstain from committing wrong acts knowingly.