I’m referring to the Hebrew in the Old Testament and the Greek in the New Testament. I found a paper in my files, but I don’t know the source. It gives me the impression that heart, spirit, and soul are used interchangeably throughout the Bible, having in some of the same meanings, and depending on how it is used in the sentence: So I’m kind of discouraged that there is any official definitions that differentiate one word from another. Here’s a summary of part of the paper I found. If anyone wants to correct, add to, or delete, please feel free:
HEART SOUL SPIRIT
“My soul yearns for you in the night; in the morning my spirit longs for you” (Isaiah 26:9).
nephesh – Old Testament Hebrew a living soul, life possessing quality, not used for a spirit (ghost); the seat of spiritual as well as physical needs and cravings, including one’s need for God’s presence (Psalm 42:1; 63:1; 84:2; 119:20); seat of the emotions and experience; stands for the living person as human being in this life.
psuche, - New Testament Greek NIV a living being, soul, person, life; Matt. 10:28 the soul cannot be killed by humans, yet the “soul” can be killed (Matthew 2:20). 1 Thessalonians 5:23, May your whole spirit, soul [psuche] and body be kept blameless at the coming of our Lord Jesus Christ."
ruach OT Hebrew, “wind,” “breath” or “spirit.” Most often refers to the Spirit of God or to the “spirit” of human beings, but not “spirit” as “part” of a human persona. Spirit from Godbreathed into a human which makes a person alive. Seat of emotional expression (Isaiah 19:14); characteristics or traits, such as , evil and good, unfaithfulness, sincerity, and humility, can be broken and crushed, and revived and refreshed; “place” of a person’s innermost thoughts.
pneuma The equivalent word for ruach in the New Testament is pneuma. It appears about 375 times. About 250 of these times, ruach refers to the Spirit of God, the Holy Spirit.
The pneuma represents an individual’s deepest thoughts and emotions (Mark 2:8; John 11:33; 1 Corinthians 2:11).
When pneuma refers to the human “spirit” it is that which makes the human being a living person