Congruent in the broadest sense refers to agreement. Agreement that things are consistent. Being congruent is way harder than what it seems.
These are three photographs from an airline.
No smoking in the Lavatory (not that it’s allowed in the cabin, BTW)
No Cigarette Disposal (just in case you decide to break the rule)
Ash Tray (For your convenience, please)
Do you see?
Being congruent is hard work. Before you laugh at the above-mentioned example, will you please take a few moments to reflect on your own life and see where you are challenged to remain congruent?