Jesus stressed that man is more valuable than a sheep, the sparrows or the fowls of the air. Yet this is just not true if humans and animals are all evolved creatures. These passages treat man as a dual being. When a distinction is made between soul and spirit, as is sometimes the case in Holy Writ, then man is depicted as a triune being. Paul wrote the Thessalonians of this triune nature.
Soul is used in a number of ways.
It may refer simply to physical life which man enjoys in common with lower forms of life. Soul may be used to refer to the intellectual nature of man. Soul is used as a synonym of that unique unity that bound early disciples together. The soul is used synonymously with the spirit to refer to man's immortal nature that survives the body and earthly life. When body, soul and spirit are all used, we are speaking of the fleshly tabernacle of clay, the earthly life that inhabits it and that immortal part which is made in God's image, in Deity's likeness.