Romans 9:21 Does not the potter have the right to make out of the same lump of clay some pottery for special purposes and some for common use?
The potter will work with clay to make different items, some for use with rubbish whilst others will be kept for the very best company!
The potter makes the decision based on his experience, what is required and what he can achieve with his clay.
God is our potter. He has final say how we are made and how we are used. He does know what is best and knows how to get the very best from any of us.
But He also gives us a choice – will be allow Him to work properly with us?