we tend to always be blinded by emotion even though it is the harness in which we plod.. we don't see it but we do see the goals that it sets us and we tend to rush headlong towards those goals so we don't see that, strangely, contentment seems to come also in the quiet pursuit of these goals as much as reaching them
so often we are not seeing the value of this the value of diligence, ie that the work in heading towards our happiness goal actually generates happiness on the way on "the journey"
(which is the opposite of the happiness that comes from drug induced elation)
part of the reason for this is that in the quiet pursuit of a goal the task at hand becomes the focus and the longer term goal fades in preeminence. when the goal set by emotions fades we find a pleasant peace as with enjoying a game of tennis without desperation to win or quietly cooking not master chef style we are somewhat released from the hold that emotions have on us