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に心を

at [a point in time], one’s mind or heart as the object of a following action

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phrase Rare #25,093
at [a point in time], one’s mind or heart as the object of a following action Used after a time expression; the action that follows describes what is done to or for the mind or heart.
JA: 若いころに心を豊かにすべきだ。
EN: You should enrich your mind while you’re young.

若いころに心を豊かにすべきだ。

You should enrich your mind while you’re young.

若い時に心を豊かにするべきだ。

You should enrich your mind while you’re young.