When one has experienced struggles, stress and problems, one can relate first hand of the emotions, thoughts, actions and results.
Paul's witness was so powerful because of the experiences he had had,visitations, blindness, floggings, shipwrecks, accusations, threats of life and limb together with personal strife with Judaisers and disgruntled followers.
What personal struggles? I feel i am in the early stages of dementia. How to handle life situations that this condition will bring, but that being "in Christ" is all that I will need.