The correct answer is A. People must rely on inner strength to overcome adversity.
Explanation:
This passage refers to both the weakness and the strength of humans. Indeed, in this passage, the author explains humans often believe they are quite powerful and they would never suffer "he thinks he will never suffer affliction down the years". However, once this happens they need to rely on themselves to face and overcome adversity. This idea is explained in "bear them he must, against his will, and steel his heart". Moreover, this idea is outside a cultural context because this is universal as in most cultures it is known hard or difficult times require people to be courageous and face difficulties using inner strength.