What is the difference between the following two?
They didn't play the game from their heart.
They didn't play the game from heart.
You didn't say that from your heart
You didn't say that from heart
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The first idiom, Y Do X From Y's Heart, is OK.
The second one, Y Do X From Heart, is ungrammatical. It should be: Y Do X From The Heart,
They didn't play the game from the heart.
The definite article is part of the idiom, and both idioms mean the same thing.
Whose heart should they play from, after all, if not their own heart(s)?