I don't like discussions about most important things in life because they miss the point. Let us say life is Ugali. If somebody asked the question; what is the most important thing in making Ugali? Is it the Unga? or is it the water? or is it the fire? no no I think it is the mwiko? Hapana wewe it is the sufuria?
Do you see how absurd this is. Take out one and you will not have Ugali. So it is with life, only that the list is endless; water, food, friends, money, sex, clothes, work, leisure, laughter, crying, education, soap, cars, beer, wazua etc.