He is only a boy in such things." And, as Plank was silent: "You will, won't you ?" "Do what--make his business my business, without an invitation ?" asked Plank, so quietly that she flushed with annoyance.
"If you pretend to be his friend is it not your duty to advise him ?" she asked impatiently.
"No; that is for his business associates to do.

Friendship comes to grief when it crosses the frontiers of business." "That is a narrow view to take, Mr.Plank." "Yes, straight and narrow.

The boundaries of friendship are straight and narrow.

It is best to keep to the trodden path; best not to walk on the grass or trample the flowers." "I think you are sacrificing friendship for an epigram," she said, careless of the undertone of contempt in her voice.
"I have never sacrificed friendship." He turned, and looked at her pleasantly.

"I never made an epigram consciously, and I have never required of a friend more than I had to offer in return.