There are several points in connection with what you say, which bear out a favorite theory of mine." "I will come in a few days, if I may," Burton assured him.
The professor walked with his guest to the front door.

He seemed reluctant to let him go.
"Take care of yourself, Mr.Burton," he enjoined.

"Yours is a precious life.

On no account subject yourself to any risks.

Be careful of the crossings.