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How to say the sentence that the heart is weak?

How do you say "the heart is willing, but the strength is weak"? Examples of its sentences are as follows:

1. There is really a state of being overwhelmed recently. I want to do a lot of things, but I have limited energy and can't do anything. The feeling of being swayed by considerations of gain and loss is really bad, and my heart is seriously consumed.

I find that many things are beyond my power, and the invisible pressure makes people breathless, but I still have to pretend to smile as if nothing has happened every day.

3, life is only for success, only blame God for making people. Pity those who have a will in the world, and waste their lives.