Holmes' famous sayings are:

1. Eliminate all impossibilities, and the remaining one, no matter how incredible it is, is a fact.

2. When genius minds cannot be put to good use, even their owners will feel bored, and even the most sensitive machines will become rusty if they are not run regularly.

3. You are watching, and I am observing. There is an obvious difference.

4. It doesn’t matter what you have done in this world. What matters is how you can convince people that you have done something.

5. The science of reasoning and analysis is the same as the craft. It can only be mastered after long-term and patient study.