Augustine of Hippo
Towards the conclusion of Ecclesiastes, it speaks of the separation that occurs at death, when the soul departs from the body: "And the dust shall return to the ground from which it came; but the spirit shall return to God who gave it." This declaration stands with authority, clear and unambiguous, presenting no room for confusion. However, if someone endeavors to interpret this declaration to suggest that since all souls derive from the one God imparted to the first human, it could endorse a notion of soul distribution, it may inadvertently support the idea expressed regarding the flesh, referred to here as dust.
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In this context, dust and spirit are to be understood as 'flesh' and 'soul'; thus, the belief that the soul, initially given to the first man, returns to God naturally follows the understanding that the physical form returns to the earth. If we consider the premise of the flesh's origin from earthly substance in the first human, then we must accept, based on the known nature of flesh, that what pertains to the soul remains veiled in mystery. Indeed, the concept of flesh’s origin is irrefutable, while matters concerning the soul invite uncertainty.