Psalms 51:12
Restore unto me the joy of thy salvation; and uphold me with thy free spirit.

Malachi 2:6
The law of truth was in his mouth, and iniquity was not found in his lips: he walked with me in peace and equity, and did turn many away from iniquity.

Luke 15:10
Likewise, I say unto you, there is joy in the presence of the angels of God over one sinner that repenteth.

King James Version (KJV)

Trust and obey for there's no other way to be happy in Jesus but to trust and obey.