Had God not loved us so much despite the sin we commit or the sinners we are, had he chosen to not send his Son to die for us and pointed his finger at us and said...You do disgusting, horrible sins I could not love you unless you change. See, we can't possibly know who God's elect are and that's not our duty. Our responsibility is to love and show Jesus to others, it's not even just a question of pointing a finger and judging but it's a question of testimony. If you stand before someone attempting to give them the gospel and yet your treating them as though they don't deserve Jesus....chances are they won't accept. Yes, it is God who draws them, but it's through us which they will see God or that's how it's supposed to be. Understanding is not something required of us to do in giving the gospel, but Jesus did understand, he saw past many things people did and knew what drove them to do the sin. Understanding and commpassion is something to be considered if you plan to show Jesus to someone else.