知难不难zhī nán bù nán

if you know something is hard ,it ceases to be difficult
❍ 读书好，耕田好，学好便好； 创业难，守成难，～。(《儒林外史》271) Study is good,farming is good: To want to make good is excellent. To build up an estate is hard,to maintain it is also hard; but if you know this they cease to be difficult.