Lǎo jiàoshòu yī fù hútu yàng, què shì dàzhì-ruòyú.
The old professor seems muddled, but he's a case of great wisdom worn as simplicity.
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From 苏轼 (Song dynasty) 《贺欧阳少师致仕启》: 大勇若怯,大智如愚 - 'great courage looks like cowardice; great wisdom looks like foolishness.' Su Shi praised Ouyang Xiu's humble retirement with this line.