what is the significance of this quote "...it occured to me that there was no difference between men, in intelligence or race, so profound as the difference between the sick and the well."

The significance of this quote is that George Wilson is making a statement in which he proclaims that all people are the same when it comes to health or illness. He is suffering from jealousy, suspicion, and the sickness of love because he doesn't know where he stands with his wife. The quote is a direct reference to these observations.