If you tell a lie often enough, you’ll come to believe it yourself.

inculcate (in·cul·cate): / in KUHL kayt /
transitive verb

(1) to impress, teach, and implant through repetitions or admonitions; to teach with earnest persistence
(2) to impress on someone’s mind the acceptance of an idea or feeling

[From Latin inculcatus, past participle of inculcare meaning “to tread on, trample over, stamp in,” from in- + calcare meaning “to trample, tread,” from calx meaning “heel.”]

Usage: His seminars expertly inculcate listeners with a profound love of nature.