Temporal possibility is possibility given the actual history of the world. David Lewis could have chosen to take his degree in Accounting rather than Philosophy; but there is an important sense in which he cannot now.
One pits his wits against apparently inscrutable nature, wooing her with ardor but nature is blind justice who cannot recognize personal identity. Charles Brenton Huggins
What one decides to do in crisis depends on one's philosophy of life, and that philosophy cannot be changed by an incident. If one hasn't any philosophy in crises, others make the decision. Jeanette Rankin