《菜根谭·修身》
所以读书做学问的人不担心染上不洁的毛病，而是担心这些毛病难以根除；不畏惧做事情时出现的各种障碍，而是畏惧追求义理之路上障碍难以排除。
故学者不患垢病，而患洁病之难治；不畏事障，而畏理障之难除。
Therefore, scholars do not worry about developing unclean habits, but worry about these habits being hard to eliminate, they do not fear all kinds of obstacles when doing things, but fear the obstacles that are hard to eliminate when pursuing the truth.