Priorities

We all have priorities in life. Things that we need to do most importantly of the several other deeds we spend our time upon. The question is, do we do that? I really wonder how many of us would give a sincere reply to that. If at all we do, I think a majority of the answer wouldn't be affirmative. So then, why is it that man doesn't prioritize his needs and deeds. If you observe, there is a direct relationship between our needs and deeds. If we prioritize our needs, that will guide our actions.
So logically if our needs are misplaced, I think, there is no way one can clearly see the priorities of life. As a student, at this stage, my need is to get good grades to ensure a good job when I graduate. So I must obviously prioritize my studies above the rest. But then, isn't it rather painful to follow the rules and regulations? The mind rebels at the thought of regulations. The travails of studies, the colorless days of working on assignments and projects somehow seem to be less important to the more pleasureable ways of dispensing the time we have in idle activites of mind, rationalizing that under the pretext of "All work and no play" stuffs. I am not bringing into consideration the issue of legitimate hobbies that we indulge in to take a break amidst the more mundane works. But, I am more concerned when the priorities are interchanged.
So what makes one to change them? Is it because, by nature, we are more attracted towards anything that involves less work on our part or one that is less taxing? Man's inherent tendency is to reap the maximum benefits by putting in the minimum amount of work. Probably this is the other face of the coin.
Then shall we call being responsible, all about being able to prioritize the needs effectively and acting accordingly? If it is so, how responsible am I?