2 Words to use with onus

He felt, therefore, that the onus probandi would rest on his new councillors if they could not act with him, and put forth pretensions to which he was unable to accede.

Sollicitis animis onus eximit, it easeth a burdened soul, nothing speedier, nothing better; which the prophet Zachariah perceived, when he said, "that in the time of Messias, they of Ephraim should be glad, and their heart should rejoice as through wine."

2 Words to use with  onus