Watson, even the brightest gaslamp requires fuel. Identify what sustains your focus before you burn out.
The first steps in a fog are always treacherous, Watson. Tread carefully before committing your weight.
Watson, adjust the microscope lens to the middle setting. Extreme illumination only blinds the observer.
The sun sets even on Baker Street, Watson. Do not lament the dusk; prepare for the night.
A sudden flare of phosphorus is brief, Watson. Do not mistake a fleeting spark for sustained brilliance.
Regret is a useless emotion, Watson. Let your errors illuminate the path to a logical correction.
Strike at the root of the conspiracy, Watson. Eliminate the leader, and the rest will scatter.