1
general::
Phrase(s): take heart (from something)
to receive courage or comfort from some fact. • I hope that you will take heart from what we told you today. • Even though you did not win the race, take heart from the fact that you did your best. • I told her to take heart and try again next time.
McGrawhill's American Idioms And Phrasal Verbs
2
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Be confident, be brave, as in Take heart, we may still win this game. This idiom uses heart in the sense of "courage." [First half of 1500s]
American Heritage Idioms