Answer:
The intermediary between men and God is bound to suffer.
Step-by-step explanation:
A Tzaddik (the righteous one in Hebrew) is a spiritual master. Because of his extraordinary piety and willpower he is considered to be the intermediary between men and God. Like Jesus, a Tzaddik is bound to relieve the common people of their pain by taking it on to himself. Carry it (the pain) on his own shoulders is a clear reference to Jesus carrying the cross, the religious symbol of suffering.