The Skeptic’s Dictionary definition of the day …

Self-deception is the process or fact of misleading ourselves to accept claims about ourselves as true or valid when they are false or invalid. Self-deception, in short, is a way we justify false beliefs about ourselves to ourselves.

Read more: self-deception – The Skeptic’s Dictionary – Skepdic.com.

Watch this EXCELLENT video -  Michael Shermer: The pattern behind self-deception (19 minutes):