In the gift of the magi the summary is giving up something that means a lot to you for someone you love because even when something is so important to you a loved one means more
Because he was young too and this is what happen to him now he want to be young again
It is a complete and correct sentence.
I hope this answers your question for i wasn't given a source or an excerpt so i looked it up.
"<span>When he is first seen by Faustus, he is horrendously ugly. Faustus immediately sends him away and has him reappear in the form of a Franciscan friar. The mere physical appearance of Mephistophilis suggests the ugliness of hell itself."
Technically this is not a math equation so i hope its ok to quote. </span><span />