Because if you base your happiness on a person they can come & go and so will your happiness but if you choose to be happy with yourself and accept yourself who you are you can find peace and happiness. You can choose to heal & get Better. Or you can add fuel to the fire etc.
being forced to be happy would NOT be reasonable. if we were forced to be happy, our emotions would be like a robot and perhaps even lack emotion. Also, we wouldn’t be as thankful for the emotion since we’d be feeling it 24/7
