“Suppose you are fit and healthy, do you think you would continue your present lifestyle?”
“Suppose you are generous, would you at least give her a helping hand?”
“Suppose you have all the resources inside you, do you think you can come up with a solution to this problem?”
The word “Suppose” does not come across as intrusive. It allows your mind to think freely and come to your own conclusion. People will hardly reject you because you do not position yourself as being authoritative or commanding.