Is the Sacrificial Lamb Precious to Us?

The sacrificial lamb has value on its own, but when it lives with you for a week, then it becomes precious to you. And something there is true when it comes to us for our participation in the mass. When we have the preparation for the tar do we put down on the altar that thing, those things that are precious to us? Or do we just can approach the lord, knowing yet he has value in himself, like ultimate value, but there's no value in our own hearts?"