In many religions and parts of philosophy, the soul is the immaterial part of a person. It is usually thought to consist of one's thoughts and personality, and can be synonymous with the spirit, mind or self. In theology, the soul is often believed to live on after the person's death, and some religions posit that God creates souls. In some cultures, non-human living things, and sometimes inanimate objects are said to have souls, a belief known as animism.

The terms soul and spirit are often used interchangeably, although the former may be viewed as a more worldly and less transcendent aspect of a person than the latter. The words soul and psyche can also be treated synonymously, although psyche has relatively more physical connotations, whereas soul is connected more closely to metaphysics and religion.

Etymology

The Modern English soul continue Old English sáwol, sáwel, first attested in the 8th century (in Beowulf v. 2820 and in the Vespasian Psalter 77.50), cognate to other Germanic terms for the same idea, including Gothic saiwala, Old High German sêula, sêla, Old Saxon sêola, Old Low Franconian sêla, sîla, Old Norse sála. The further etymology of the Germanic word is uncertain. A common suggestion is a connection with the word sea, and from this evidence alone, it has been speculated that the early Germanic peoples believed that the spirits of deceased rested at the bottom of the sea or similar. A more recent suggestion connects it with a root for "binding", Germanic *sailian (OE sēlian, OHG seilen), related to the notion of being "bound" in death, and the practice of ritually binding or restraining the corpse of the deceased in the grave to prevent his or her return as a ghost.

The word is in any case clearly an adaptation by early missionaries to the Germanic peoples, in particular Ulfilas, apostle to the Goths (4th century) of a native Germanic concept, coined as a translation of Greek psychē "life, spirit, consciousness".

The Greek word is derived from a verb "to cool, to blow" and hence refers to the vital breath, the animating principle in humans and other animals, as opposed to lang: σῶμα (soma) meaning "body". It could refer to a ghost or spirit of the dead in Homer, and to a more philosophical notion of an immortal and immaterial essence left over at death since Pindar. Latin figured as a translation of lang: ψυχή since Terence. It occurs juxtaposed to lang: σῶμα e.g. in :

— lang: καὶ μὴ φοβηθεῖσθε ἀπὸ τῶν ἀποκτεννόντων τὸ σῶμα, τὴν δὲ ψυχὴν μὴ θε δὲ μᾶλλον τὸν δυνάμενον καὶ ψυχὴν καὶ σῶμα ἀπολέσαι ἐν γεέννῃ.