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Keep thy heart with all diligence; for out of it are the issues of life.
New Defender's Study Bible Notes
4:23 heart. In Scripture, the heart is both the physical organ energizing the circulatory system and also the seat of the intellect and emotions. This truth is valid in both cases. A well-maintained, healthy heart and circulation are essential to optimum effectiveness in every area of one’s natural life, and a heart right before God spiritually is essential to a truly fruitful Christian life.