Interviewed by Val Farmer for a feature article entitled «Empathy can open door of the heart,» Preston Connection Syndicate, appeared week of March 1, 1999. (robscuka.com)
A more pictorial and naturalistic but no less conceptualized variation on this approach is the popular painting by William Holman Hunt, The Light of the World (1851 - 1853), in which Christ knocks at the allegorical door of the heart, waiting to enlighten it with his lamp of truth. (religion-online.org)
This has been true since God warned Cain of the sin crouching at the doors of his heart (Gen. 4:7); since David asked God to search his heart and exposes any grievous ways (Ps. (christianitytoday.com)