To become deeply rooted in people's hearts; to be widely accepted and influential.
指理论、学说、政策等为人们深切了解和信服。
明·冯梦龙《东周列国志》第二十回且君新得诸侯，非有存亡兴灭之德，深入人心，恐诸侯之兵，不为我用。”
The concept of environmental protection has gradually penetrated deep into the hearts of the people.
Learn the next connected idiom: 深入人心 (shēn rù rén xīn) → 心有余悸 (xīn yǒu yú jì)
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