It is the difference in rank that constitutes the unsuitability.
"Let us see, then, how far you are right--how far suitability is a question of rank.

A gentleman may be, and frequently is, a drunkard, a gambler, a libertine, or all three combined." "Stay, Mr.Conolly! You show how little you understand the only true significance----" "One moment, Mr.Lind.You are about to explain away the term gentleman into man of honor, honest man, or some other quite different thing.

Let me put a case to you.

I have a fellow at Queen Victoria Street working for thirty shillings a week, who is the honestest man I know.

He is as steady as a rock; supports all his wife's family without complaining; and denies himself beer to buy books for his son, because he himself has experienced what it is to be without education.