There are many mysteries in old age but the greatest, surely, is this: in those adverts for walk-in bathtubs, why doesn't all the water gush out when you get in?
A writer can be compared to a well. There are as many kinds of wells as there are writers. The important thing is to have good water in the well, and it is better to take a regular amount out than to pump the well dry and wait for it to refill.
If a writer of prose knows enough about what he is writing about he may omit things that he knows and the reader, if the writer is writing truly enough, will have a feeling of those things as strongly as though the writer had stated them. The dignity of movement of an iceberg is due to only one-eighth of it being above water. A writer who omits things because he does not know them only makes hollow places in his writing.
As I turned away, I saw Holmes, with his back against a rock and his arms folded, gazing down at the rush of the waters. It was the last that I was ever destined to see of him in this world. - Watson.