Whose Prayers are Greater?

Another incident involving Ben Dosa, who went to study
Torah before Ben Zakkai, and Ben Zakkai's son fell ill.

Ben Zakkai:	Chanina, my son, pray for mercy on behalf of my son so that he will live.
Ben Dosa placed his head between his knees in order to meditate and prayed for mercy upon his behalf, and Ben Zakkai's son lived.
Ben Zakkai:	Had Ben Zakkai stuck his head between his knees throughout the entire day, they would have paid him no attention.