They have a far greater fear of the spirits of the dead, especially those whom they have offended, than of Wahkon-tun-kah, the Great Spirit.
* * * * * One of the punishments they most dread is that of the body of an animal entering theirs to make them sick.

Some of the medicine men, the priests, and the doctors of the Dahcotahs, seem to have an idea of the immortality of the soul but intercourse with the whites may have originated this.

They know nothing of the resurrection.
They have no custom among them that indicates the belief that man's heart should be holy.

The faith in spirits, dreams, and charms, the fear that some enemy, earthly or spiritual, may be secretly working their destruction by a spell, is as much a part of their creed, as the existence of the Great Spirit.
A good dream will raise their hopes of success in whatever they may be undertaking to the highest pitch; a bad one will make them despair of accomplishing it.

Their religion is a superstition, including as few elements of truth and reason as perhaps any other of which the particulars are known.