what is the true sense?each and every one of us create the "true sense" of the happiness that fits best to us.For someone to be happy all the time, it must be that he/she is an one dimensional being.People probably have the capability to be happy,sad,angry,worried,relaxed,in love, in pain etc.
life is about up and downs and without the downs you don't recognize how good the ups are. happiness is a falsehood to constantly seek as it is very fleeting. Try to replace this concept with contentment meaning you are happy where you are, what you have done and what you will do. We are imperfect and that's okay because that is what makes us human.
"Tis a passing fancy, greatly to be cherished and remembered." You have to be manic to be happy all the time.