In Jeffery Archer’s popular novel, “Kane & Abel,” there is a scene where William Kane, a brilliant student of St. Paul’s and one of two leading characters of this novel seduced by the wife of the school’s homemaster during her husband being out of home on trip for attending a conference.
When William reported Mrs. Raglan Rags, the homemaster’s wife that all the lights of the dorm were out and he had locked the front door, and bid ‘Good night,’ to her;
She swung her legs on to the ground, and a pale flash of stockinged thigh appeared momentarily from under the draped silk. “You are always in such a hurry. William. You can’t wait for your life to begin, can you?” She walked over to a side table. “Why don’t you stay and have some hot chocolate?”
Is the phrase, “You can’t wait for your life to begin,” a well-used pattern phrase, cliche, or just an ad hoc line invented for this situation? What does it mean?
If it is a pattern phrase, in what else cases can I use it for example?