In the late 1970s, I was sitting in a charting station at Brookfield Hospital in Wisconsin. A little tired, I complained to the social worker next to me about having to get up in the night when my son cried from his bedroom next to ours.
She looked at me, tilted her head to the side, and said, "But that is what you are here for."
Never again did it bother me when my son cried. With every parenting task and challenge that followed, that phrase became the emotional soundtrack.