Lǐlùn xué qǐlái bù nán, shíjiàn zhōng què zhīyìxíngnán.
The theory is easy to grasp, but in practice it's much harder to apply.
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history
Rooted in 《尚书·说命中》: 非知之艰，行之惟艰 — Fu Yue's counsel to the Shang king that 'knowing is not the hard part; doing is.' Sun Yat-sen famously inverted this into 知难行易 (zhīnánxíngyì) in his political philosophy.
