Other joys he saw in abundance: high trees, with many branches, on which the birds of heaven sat and sang their notes with merry glee, some low, some intermediate, and some high. He thought indeed that with the song of those birds he might live happily there until the end of the world. Then he saw the tree of life, because of which Adam and his wife went to hell. Fair were the arbors, there, with flowers,—roses and lilies of many colors, primroses and periwinkle, mint, featherfoy and eglantine, columbine, and many others, more than man can think. Herbs of other kinds than on earth grow there, though that is the least of the praises of the place. Forever they spring up green, sweeter than licorice, unchanging in winter and summer. There are wells in that spot, with water sweeter than any mead, and out of the chief one which Owain saw, run the four streams of paradise. Pison, they call one stream that gleams brightly, because men find gold there; Gihon is another that is much praised for the precious stones in its bed; the third stream is named Euphrates, it runs straight along; and the fourth is Tigris, in all the world is there none other with stones so bright. Whosoever loves to live in purity shall have that same bliss and see that same sight. More Owain saw there, under God's glory on high; blessed be His might! Some souls he saw apart by themselves, and some in groups of ten or twelve; and when they met together they made as much rejoicing as sister does with brother. Some he saw going about in scarlet red, some in purple well wrought, and others in thin silk. They wore tunics and albs, like what the priest wears at mass, some covered with gold work. The knight knew well by their clothing in what state they were, and what deeds they had done when they were men's companions. I will tell you a fair similitude drawn from the clear stars; inasmuch as one star is brighter to the sight and of more power than three others, so is it with the joys of paradise. They are not all alike, yet he who has the least joy thinks he has the most of all and calls himself very rich.