Therefore, He had to be made like His brethren in all things, so that He might become a merciful and faithful high priest. For since He Himself was tempted in that which He has suffered, He is able to come to the aid of those who are tempted. Hebrews 2:17-18
God seems to do the same thing with ministers. He spends the first half of the their life building a reservoir of tears so that they may spend the last half crying it out on behalf of their people.