John 10:11 I am the good shepherd. The good shepherd lays down his life for the sheep.
The word for today is concupiscence, and it the result of original sin, it is the desire to sin, and it leaves man without the true fear of God, and unable to put true trust in God. Concupiscence explains why there is Isaiah 53:6 All we like sheep have gone astray; we have turned every one to his own way; and the LORD has laid on him the iniquity of us all. Let me put in another way, concupiscence explains why we believe that the grass is always greener on the other side of the fence, when being on the otherside of the fence is transgression, trespass, and sin.
You see, man is not basically good - by ourselves we are all sinners, we have gone astray, we have gone our own way - that is, we have not gone God's way, we have not been, as we have promised, faithful unto death. Let me remind you that this promise was made for us at our baptism, that we would be faithful, and follow our savior - and we renewed that promise at confirmation. We promised to be faithful, and we have not - and not only that but having gone astray we do not know how to find our way home - that's what it is to be lost in sin. And if it were not bad enough to be lost in sin, all you need to do is remember that the wages of sin is death, not just and end of this life, but all eternity sepparated from God in hell.
At our baptism our parents promised that they would teach us the holy scriptures, that they would teach is so that we would know the way of salvation, which is by grace through faith in Christ, and that they would train us in holy living. You see, all we like sheep have gone astray, but Jesus paid the price, Jesus suffered for our sins, Jesus died for our sins. Jesus is the good shepherd, and we need a good shepherd.