不是美国总统说的,谷歌上提了很多人都说了,但找不到出处!比较好的答案是出自西元10年的一位犹太圣者宗教领袖 Hillel
This paraphrases the famous saying by the renowned Jewish sage and Jewish religious leader,
Hillel , who died in the year 10 of the common era and who said:
"If I am not for myself, who will be for me?"
" And when I am for myself, what am I?"
" And If not now, when?"
后来出现很多演化版,提问人说的就是其中一个。
阿里巴巴办公室里有的一句话