Pivotal circumstances can be positive or negative. However, it seems from experience that the negative circumstances of life are what typically help us grow the most.
The call...
The diagnosis....
The relationship....
The tragedy....
While we wouldn't sign-up for this to happen again, somehow God grew our faith in a way maybe He couldn't have done another way. In John 11, we read of a circumstance that Jesus allowed to happen so that He could strengthen the faith of the people.
While in this life we will have difficult circumstances, it is critical to have Christian community support and to remember that God is with us.