Because
Genesis 41:51
And Joseph called the name of the firstborn Manasseh: For God, said he, hath made me forget all my toil, and all my father's house.
Proverbs 31:7
Let him drink, and forget his poverty, and remember his misery no more.
Ecclesiastes 5:20
For he shall not much remember the days of his life; because God answereth him in the joy of his heart.
Isaiah 54:4
Fear not; for thou shalt not be ashamed: neither be thou confounded; for thou shalt not be put to shame: for thou shalt forget the shame of thy youth, and shalt not remember the reproach of thy widowhood any more.
Isaiah 65:16
That he who blesseth himself in the earth shall bless himself in the God of truth; and he that sweareth in the earth shall swear by the God of truth; because the former troubles are forgotten, and because they are hid from mine eyes.
John 16:21
A woman when she is in travail hath sorrow, because her hour is come: but as soon as she is delivered of the child, she remembereth no more the anguish, for joy that a man is born into the world.
Revelation 7:14-17
14
And I said unto him, Sir, thou knowest. And he said to me, These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb.
15
Therefore are they before the throne of God, and serve him day and night in his temple: and he that sitteth on the throne shall dwell among them.
16
They shall hunger no more, neither thirst any more; neither shall the sun light on them, nor any heat.
17
For the Lamb which is in the midst of the throne shall feed them, and shall lead them unto living fountains of waters: and God shall wipe away all tears from their eyes.
as waters
Job 6:15
My brethren have dealt deceitfully as a brook, and as the stream of brooks they pass away;
Genesis 9:11
And I will establish my covenant with you; neither shall all flesh be cut off any more by the waters of a flood; neither shall there any more be a flood to destroy the earth.
Isaiah 12:1
And in that day thou shalt say, O LORD, I will praise thee: though thou wast angry with me, thine anger is turned away, and thou comfortedst me.
Isaiah 12:2
Behold, God is my salvation; I will trust, and not be afraid: for the LORD JEHOVAH is my strength and my song; he also is become my salvation.
Isaiah 54:9
For this is as the waters of Noah unto me: for as I have sworn that the waters of Noah should no more go over the earth; so have I sworn that I would not be wroth with thee, nor rebuke thee.