英文高手請進

background information: 爸爸在911死去, 子女好傷心,並相繼出現一些情怠上的問題,媽媽於是找一些治療可以舒緩他們的情緒
請翻譯:
1.Looking back, i realize that i was too impatient with grief. One must allow time for seemingly little progress. Grief has its own timetable for each person.
2. In all honesty, it was Mattew who was the impetus for their therapy sessions.我想問 impetus 可以用咩字呢?