And indeed there will be time To wonder, "Do I dare?" and, "Do I dare?" Time to turn back and descend the stair, With a bald spot in the middle of my hair.
Well, I do not mind telling you I have been at work upon this geometry of Four Dimensions for some time. Some of my results are curious. For instance, here is a portrait of a man at eight years old, another atfifteen, another at seventeen, another at twenty-three, and so on. All these are evidently sections, as it were, Three-Dimensional representations of his Four-Dimensioned being, which is a fixed and unalterable thing.
The large shiny black forehead of the first whale was no more than two yards from us when it sank beneath the surface of the water, then we saw the huge blue-black bulk glide quietly under the raft right beneath our feet. It lay there for some time, dark and motionless, and we held our breath as we looked down on the gigantic curved back of a mammal a good deal longer than the raft.
Depend upon it there comes a time when for every addition of knowledge you forget something that you knew before. It is of the highest importance, therefore, not to have useless facts elbowing out the useful ones.