The quote basically is saying how the feelings of remembrance and loss can connect with one another. For example, the wake of Junior's grandmother is a moment where it occurs. hope this helps...
Sherlock Holmes is a detective, while Watson is a doctor. This shows that Sherlock is more of an artist, willing to go beyond the facts of science. Watson tries his hardest to get the art, but his more practical mind just doesn't allow it. Hope I helped!