SINGLENESS OF HEART MATTHEW 12:32-45 Our spirit is definitely a part of our heart, but as seen in 1 Peter 3:4, it is only a part. Sin, iniquity, unbelief, etc., come from the heart but not the born-again spirit. Hebrews 4:12 suggests that spirit and soul are both part of the heart; hence, the scriptures admonish us to believe with all our heart (Acts 8:37), have singleness of heart (Col. 3:22), and tell us our hearts can have two minds or ways of thinking (Jas. 4:8). Even Christians still struggle with things like pride and foolishness which Jesus said came out of our heart. It's certain that our born again spirit is not the source of these sins. The heart encompasses more than our spirit. The English word "soul" comes from the Greek word "psuche," translated "heart, life, mind, and soul." The mind is the principle and leading part of the soul, followed by the will and emotions. We could also describe the soul as being the ...