We are called to show God's Holiness in the way that we live. When we live a life of holiness, we should be pure and show love, honesty and generosity towards others. Living a holy life is pleasing to God and a sign of the believers true commitment to God.
When we live a life that is not holy it is described as "uncleanness" which is the opposite of living according to God's plan. Everywhere we turn people try to influence us but the Word of God is where we can learn to act like Christians.
Living a holy life not only helps us but it helps others as well. If we are living as God calls us to do it makes our commitment to Christ stronger, therefore our lives serves as a witness to others.
Always remember that you represent God and you have a godly responsibility to display godly character to the world. The best way to do this is to love others as you love yourself.