Excerpt from "The Reward of the Righteous Women":
The story is told of a chassid who would occasionally leave his family to travel to the Bnei Yissachar zt"l. His wife would protest at the great difficulty of being left alone to care for their many young children. Once, upon discussing an upcoming trip, she agreed to let him go on condition that he promise her half of his reward for the mitzvah of visiting the Rebbe, and that he inform the Rebbe of their agreement.
When the chassid told the Rebbe of the condition he had made with his wife, the Rebbe scolded him. "Fool! You should have asked her for half of her reward, which is far greater than your own. She is the one left behind to care for the children, a most difficult and thankless task. You on the other hand, have a thoroughly enjoyable time here, experiencing the spiritual delights of being with your Rebbe and the other chassidim. You see therefore, that her reward is greater than yours."