The Joy of salvation is not happiness. It is to have a future and a hope,
and that the life we lead will not be in vain.
Hebrews 12:2 looking unto Jesus, the author and finisher of
our faith, who
for the joy that was set before Him endured the cross, despising the shame,
and has sat down at the right hand of the throne of God.
Our joy is "set before us", and is not of this world or this life.
Philippians 3:
10 that I may know Him and the power of His resurrection,
and
the fellowship of His sufferings, being conformed to His death,
11 if, by any means, I may attain to the resurrection from the dead.
12 Not that I have already attained, or am already perfected; but I press on,
that I may lay hold of that for which Christ Jesus has also laid hold of me.
13 Brethren, I do not count myself to have apprehended; but one thing
I do,
forgetting those things which are behind and reaching forward to those
things which are ahead,
14 I press toward the goal for the prize of the upward call of God in Christ Jesus.