Why is, according to Fish, speech always attached to "pre-known" situations and contexts? What example does Fish use to explain and support this concept?

What effect does this excerpt have? the line of the horizon was clear and hard against the sky, and in one particular quarter it showed black against a silvery climbing [glow] that grew and grew. at last, over the rim of the waiting earth, the moon lifted with slow majesty till it swung clear of the horizon and rode off, free of *moorings; and once more they began to see surfaces—meadows wide-spread, and quiet gardens, and the river itself from bank to bank, all softly disclosed, all washed clean of mystery and terror, all radiant again as by day, but with a difference that was tremendous. their old haunts greeted them again in other *raiment, as if they had slipped away and put on this pure new apparel and come quietly back, smiling as they shyly waited to see if they would be recognized again under it. fastening their boat to a willow, the friends landed in this silent, silver kingdom, and patiently explored . . then a change began slowly to declare itself. the horizon became clearer, field and tree came more into sight, and somehow with a different look; the mystery began to drop away from them. a bird piped suddenly, and was still; and a light breeze sprang up . . rat . . sat up suddenly and listened with a passionate intentness. mole, who with gentle strokes was just keeping the boat moving while he scanned the banks with care, looked at him with curiosity.

(1) fire extended humans’ geographical boundaries by allowing them to travel into regions that were previously too cold to explore. (2) it also kept predators away, allowing early humans to sleep securely. (3) fire, in fact, has been a significant factor in human development and progress in many ways. (4) other obvious benefits of fire are its uses in cooking and in hunting. (5) probably even more important, however, is that learning to control fire allowed people to change the very rhythm of their lives. (6) before fire, the human daily cycle coincided with the rising and setting of the sun. (7) with fire, though, humans gained time to think and talk about the day’s events and to prepare strategies for coping with tomorrow. the sentence that expresses the main idea is: (type the number of the sentence. then click “go.”)

Write one paragraph that evaluates the effectiveness of jack zipes’s essay.