Watson, a steam engine requires quality coal, not soot, to function. Mind what you consume.
Watson, staring at your neighbor's hearth while your own fire dies is a grave logical error.
Begging for scraps from lesser minds, Watson, will only starve your own analytical faculties.
Watson, refusing to read the telegram will not alter the bad news it contains.
Pursue your evidence like a hound on a scent, Watson. Determination yields the necessary data.
Watson, when the fog is thick, halt the carriage and listen. Do not force the path.
You are the lighthouse, Watson; keep your lamp burning bright to guide the lost vessels.