So the ransomed of the Lord will return and come with joyful shouting to Zion, and everlasting joy will be on their heads.  They will obtain gladness and joy, and sorrow and sighing will flee away.

Isaiah 51:11

In this you greatly rejoice, even though now for a little while, if necessary, you have been distressed by various trials, so that the proof of your faith, being more precious than gold which is perishable, even though tested by fire, may be found to result in praise and glory and honor at the revelation of Jesus Christ; and though you have not seen Him, you love Him, and though you do not see Him now, but believe in Him, you greatly rejoice with joy inexpressible and full of glory, obtaining as the outcome of your faith the salvation of your souls.

1 Peter 1:6-9

Do not let your heart be troubled; believe in God, believe also in Me.

John 14:1