Waiting for Number Eight

Why is it so hard to see God's design--or to wait until it unfolds? Samuel didn't want a new king for Israel at all, and when he was choosing one from Jesse's sons, he was ready to choose the first one. God said NO. Samuel had to go through seven sons, all of whom looked like a perfect king, before the eighth son, David, showed up, young and inexperienced, dragged out of the fields. He was totally unlikely--the wrong one. Just as Jesus was unlikely to be God's chosen Messiah, and he was rejected, until God did a new thing in his death and resurrection! How many possibilites am I missing, because I think I have it all figured out? Hopefully, I can wait until number eight every time I am trying to find the right path to follow Jesus.