Why Isaac Post?
He was nearby and having a Quaker background, he was open to the Gifts from Spirit, where people can communicate with Angels, etc.
And then there was the rappings?
History is filled with people who got messages via rappings way before the Fox sisters and Mother came on the scene in 1848. An interesting science is Typtology, which is the scientific word for rapping.
Happiness is the result of an enlightened mind whereas suffering is caused by a distorted mind.