Below is an example summary of this reading selection:
Recounting a time from her childhood when she was chased for throwing snowballs at passing cars, Dillard explains how throwing oneself into an activity wholeheartedly and with abandon provides the greatest feeling and moment of happiness. Single-mindedly focusing on the moment and enjoying it to the fullest, "flinging" herself into the chase, she realizes it can't last but is the most exhilarating experience.
Your summary will differ from this one in the way it is written, but it should include roughly the same information.