Needs must, and so on. - Kate Atkinson

...but one cannot look backward, only forward. What has passed has passed forever.

A simple acceptance of what comes to us, regarding it as neither bad nor good.
“Werde, der du bist, as he would have it,” Dr Kellet continued ... “It means become who you are,” he said.

"Sweet sixteen," Hugh said, kissing her affectionately. "Happy birthday, little bear. Your future's all ahead of you." Ursula still harbored the feeling that some of her future was also behind her but she had learned not to voice such things.