‘这则寓言告诉我们，有些事情说起来容易，做起来却很难 ’用英语怎么说？

this allegory tells us , something is easy to say but hard to do

the fable tells us" easy talk than do"

What the fable tells us is that" easy talk than do"

供参考：

this fable tells us that some things are easier said than done.

说起来容易做起来难(easier said than done)