“Upon my word, Watson!" said Holmes at last with an unsteady voice, "I owe you both my thanks and an apology. It was an unjustifiable experiment for one’s self, and doubly so for a friend. I am really very sorry."
“You know,” I answered with some emotion, for I had never seen so much of Holmes’s heart before, “That it is my greatest joy and privilege to help you.”
The Adventure of the Devil’s Foot