World's End by Richard Jefferies

The grand family council was to be held at Stirmingham on the coming New Year's Day. How difficult it is to trace the genesis of an idea! It does not seem to have any regular growth -- to begin with a seed and cast out roots, a stem, branches, leaves; it shoots now one way, now this, like those curious creatures revealed by the microscope, or like the germs of fungi. Upon the original thought odd branches are engrafted, accidental circumstances suggest new developments, till at last the full completed idea bears no sort of resemblance to what might have been expected from the embryo.

How the idea was first started neither Marese nor Theodore could tell, nor how it was communicated from one to the other. There is a method of communication which is not dependent upon direct speech; there is a way of talking at a subject without mentioning it. When two clever men's minds are full of one absorbing topic it does not require formal sentences to convey their conceptions. They did not seem even to actually talk of it, and yet it grew and grew, till it overshadowed them like a vast gloomy mountain.