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It's very easy to learn. And very difficult to master.
Not everything that is more difficult is more meritorious.
Falsehood is easy, truth so difficult.
There is nothing so easy but that it becomes difficult when you do it reluctantly.
I'm a very difficult person to live with.
We have to pray with our eyes on God, not on the difficulties.
It's very difficult to release an X-rated movie.
My father was a very difficult man.
It is easy to talk on religion, but difficult to practice it.