Genesis 18:19 For I have known him, in order that he may command his children and his household after him, that they keep the way of the Lord, to do righteousness and justice, that the Lord may bring to Abraham what He has spoken to him.”
There are people who have been chosen by God for special reasons who are used as examples for the rest of us to follow.
God has special knowledge of our abilities and places us in positions where we can use those abilities in the best ways.
God knew Abraham would do what was right. He knows what we will do already. We are the ones who have to step up to the mark and fulfil our tasks for Him.