Ten Years Later: The Man in The Iron Mask by Alexandre Dumas Chapter 14 Page 14

“It is not thus you should speak of our friendship,” replied the bishop, in a firm, assured voice; “for ours is not of the same nature as those of which you have been speaking.”

“Look at us, Aramis; three out of the old ‘four.’ You are deceiving me; I suspect you; and Porthos is fast asleep. An admirable trio of friends, don’t you think so? What an affecting relic of the former dear old times!”

“I can only tell you one thing, D’Artagnan, and I swear it on the Bible: I love you just as I used to do.

If I ever suspect you, it is on account of others, and not on account of either of us. In everything I may do, and should happen to succeed in, you will find your fourth. Will you promise me the same favor?”