What does the following phrase mean “士不可不弘毅, 任重而道遠”?
It comes from 《论语·泰伯章》:

Chapter 7
　　曾子曰：“士不可以不弘毅，任重而道遠。仁以爲己任，不亦重乎？死而後已，不亦遠乎？”
The necessity to the officer of compass and vigor of mind

The philosopher Tsang said, &quot;The officer may not be without breadth of mind and vigorous endurance. His burden is heavy and his course is
long.

&quot;Perfect virtue is the burden which he considers it is his to sustain;-- is it not heavy? Only with death does his course stop;-- is
it not long?



Another version from baidu:

An educated gentleman cannot but be resolute and broad-minded, for he has taken up a heavy responsibility and a long course. Is it not a heavy responsibility, which is to practice benevolence? Is it not a long course, which will end only with his death?