后天易吟三十首hòu tiān yì yín sān shí shǒu后天易吟三十首 shǐ tún zhōng wèi jì, shì gù xìn duō jiān.始屯终未济,世故信多艰。wéi kǎn gāng zhōng jí, zhōu xuán xiǎn nán jiān.维坎刚中吉,周旋险难间。始屯终未济,世故信多艰。维坎刚中吉,周旋险难间。