Do we understand what sin really is? What actually is grace? When we pray, Hail Mary, full of grace, what do we really mean? The course on Sin and Grace is intended to motivate the students to understand the risks of the sinful nature of human beings and the importance of God’s grace. The course begins with biblical evidence with regard to the nature of sin and discusses in detail the teaching of the Council of Trent regarding the Original Sin. The second part of the course deals with the actual position of the theology of Grace in the overall context of theology and the different approaches to the subject. Grace is really a share in the Divine life which is given through God’s self-communication, which we receive through various ways, and finally in justification.