Can you please discuss the key to happiness?

More than one: 1) having more gratitude than resentment 2) having satisfying, loving relationships 3) having lots of positive emotions 4) being engaged in a job/ career 5) serving causes beyond oneself and one's own ambitions 6) knowing that everything has a cost and there is no perfect life, job, spouse, etc only really good and to be thankful for.

Wordly vs soulful: Accomplishment, power, money etc are worldly feelings and provide excitement, not happiness. Love, intimacy, trust, respect, communication are soulful feelings and provide more happiness. Be awake and aware of when these events are happening and tune into happiness.