The early Celts recognized an intimate relationship between man and nature: unperceived by man, unseen forces--not dissimilar to what Melanesians call _Mana_--(looked on as animate and intelligent and frequently individual entities) guided every act of human life. It was the special duty of Druids to act as intermediaries between the world of men and the world of the Tuatha De Danann; and, as old Irish literature indicates clearly, it was through the exercise of powers of divination on the part of Druids that these declared what was taboo or what was unfavourable, and also what it was favourable for the divine king or hero to perform. As long as man kept himself in harmony with this unseen fairy-world in the background of nature, all was well; but as soon as a taboo was broken, disharmony in the relationship--which was focused in a king or hero--was set up; and when, as in the case of Cuchulainn, many taboos were violated, death was inevitable and not even the Tuatha De Danann could intercede. Breaking of a royal or hero taboo not only affects the violator, but his subjects or followers as well: in some cases the king seems to suffer vicariously for his people. Almost every great Gaelic hero--a god or Great Fairy Being incarnate--is overshadowed with an impending fate, which only the strictest observance of taboo can avoid.[216] Irish taboo, and inferentially all Celtic taboo, dates back to an unknown pagan antiquity. It is imposed at or before birth, or again during life, usually at some critical period, and when broken brings disaster and death to the breaker. Its whole background appears to rest on a supernatural relationship between divine men and the Otherworld of the Tuatha De Danann; and it is very certain that this ancient relationship survives in the living Fairy-Faith as one between ordinary men and the fairy-world. Therefore, almost all taboos surviving among Celts ought to be interpreted psychologically or even psychically, and not as ordinary social regulations. FOOD-SACRIFICE Food-sacrifice plays a very important rôle in the modern Fairy-Faith, being still practised, as our evidence shows, in each one of the Celtic countries. Without any doubt it is a survival from pagan times, when, as we shall observe later (in chapter iv. 291, and elsewhere), propitiatory offerings were regularly made to the Tuatha De Danann as gods of the earth, and, apparently, to other orders of spiritual beings. The anthropological significance of such food-sacrifice is unmistakable.