Heavier bow provides needed resistance that force archer to refine and develop, but there is a fine balance here: An archer should not overpower the bow and the bow should not overpower the shooter. An archer has to work with the bow, with its strength, to be a good archer.
There seems to be a parallel in life: Problems and difficulties in life resemble the bow's resistance. We need enough challenge to keep us improving but not too much to overpower us. More importantly, we need to work with challenges, use them as the strength of a bow, to our advantage and to achieve our goals.