Merriam-Webster defines “happiness” as (a) a state of well-being and contentment or (b) a pleasurable or satisfying experience. “A pleasurable or satisfying experience” relates to happiness being temporary. “A state of well-being and contentment” could mean either permanent or temporary. Can a person live in continuous happiness in this world? I suppose the majority would say “no;” but, deep inside me, I want to say it is possible.
To support this, we think of the Beatitudes. Happy are the humble whose confidence is in God. Happy are those who mourn over their sins and the sins of others, for they will be comforted by God. Happy are the meek; they know they shall inherit the kingdom. Happy are they who hunger and thirst for righteousness, for they will be satisfied. Happy are the merciful, for they will be shown mercy. Happy are the pure of heart, for they will see God. Happy are the peacemakers, for they will be called children of God. Happy are they who are persecuted for the sake of righteousness, for theirs is the kingdom of heaven. Happy are you when they insult you and persecute you and utter every kind of evil against you [falsely] because of Christ. Rejoice and be glad, for your reward will be great in heaven. Thus they persecuted the prophets who were before you.
Happiness is in Life, not death (temporal things), and Life is in God, through Jesus Christ, by power of the Holy Spirit. T.T.