Only those who personally experience something truly understand its nature and nuances; one knows best by one's own experience.
他们对我们的项目提出了很多建议，但我知道实际操作的困难，真是如饮水者，冷热自知啊。
They offered many suggestions for our project, but I know the practical difficulties firsthand; as the saying goes, only the one who drinks the water knows if it's hot or cold.
Next Idiom