The Awakening by Kate Chopin

But that night she was like the little tottering, stumbling, clutching child, who of a sudden realizes its powers, and walks for the first time alone, boldly and with overconfidence. She could have shouted for joy. She did shout for joy, as with a sweeping stroke or two she lifted her body to the surface of the water.

A feeling of exultation overtook her, as if some power of significant import had been given her to control the working of her body and her soul. She grew daring and reckless, overestimating her strength. She wanted to swim far out, where no woman had swum before.