Assurance comes from daily living out your faith in hope.*
How does one live out his faith? By making choices that prove in thought, word and deed that he trusts Almighty God. There is no other way to be happy in Jesus, but to trust and obey!
It's a struggle at first. Oh, what joy - what assurance - comes afterward!
* This thought came to me at the end of Pastor Pete's sermon last Saturday night, 20060128.