One should always look for a possible alternative and provide against it. It is the first rule of criminal investigation.

I never make exceptions. An exception disproves the rule.

There have,” said I, “been numerous petty thefts.”
Holmes snorted his contempt.
“This great and sombre stage is set for something more worthy than that,” said he. “It is fortunate for this community that I am not a criminal.

You know my methods. Apply them.

Dear me, Watson, is it possible that you have not penetrated the fact that the case hangs upon the missing dumb-bell?

You know my method. It is founded upon the observation of trifles.