The Joy of Salvation is first experienced in believing.

1 Peter 1:8  Whom having not seen, ye love; in whom though now ye see him not, yet believing, ye rejoice with joy unspeakable and full of glory. 


There's also joy in the cleansing, in the endurance, in obeying, and in knowing that we are kept and secure in Christ Jesus.


1 Peter 1:4  To an inheritance incorruptible and undefiled, and that fadeth not away, reserved in heaven for you.


Sadly, the joy of salvation can be lost in several ways.
By allowing the world to come between us and Jesus
By neglecting our prayer life
By failing to fully believe God's promises
By submitting to the enticing words of sinners
By being swept away with every wind of doctrine
By neglecting the privilage of church attendance


But we can re-claim that joy by confessing our sins, renewing our Christian vows, and resuming our Christian responsibilities. If we draw nigh to our God, He will draw nigh unto us.