Thou shalt also forget misery, and remember it only as waters that are passed away.

Because

Genesis 41:51 And he called the name of the firstborn Manasses, saying: God hath made me to forget all my labours, and my father's house.

Proverbs 31:7 Let them drink, and forget their want, and remember their sorrow no more.

Ecclesiastes 5:20 For he shall not much remember the days of his life, because God entertaineth his heart with delight.

Isaiah 54:4 Fear not, for thou shalt not be confounded, nor blush: for thou shalt not be put to shame, because thou shalt forget the shame of thy youth, and shalt remember no more the reproach of thy widowhood.

Isaiah 65:16 In which he that is blessed upon the earth, shall be blessed in God, amen: and he that sweareth in the earth, shall swear by God, amen: because the former distresses are forgotten, and because they are hid from my eyes.

John 16:21 A woman, when she is in labour, hath sorrow, because her hour is come; but when she hath brought forth the child, she remembereth no more the anguish, for joy that a man is born into the world.

Revelation 7:14-17 And I said to him: My Lord, thou knowest. And he said to me: These are they who are come out of great tribulation and have washed their robes and have made them white in the blood of the Lamb. . . .

as waters

Job 6:15 My brethren have passed by me, as the torrent that passeth swiftly in the valleys.

Genesis 9:11 I will establish my covenant with you, and all flesh shall be no more destroyed with the waters of a flood, neither shall there be from henceforth a flood to waste the earth.

Isaiah 12:1,2 And thou shalt say in that day: I will give thanks to thee, O Lord, for thou wast angry with me: thy wrath is turned away, and thou hast comforted me. . . .

Isaiah 54:9 This thing is to me as in the days of Noe, to whom I swore, that I would no more bring in the waters of Noe upon the earth: so have I sworn not to be angry with thee, and not to rebuke thee.