Cardijn often summarised his key ideas in the form of triples, the most famous of which of course is see, judge, act, and also doubles.
Here is a list of some of the most important ones, which feature in the various Classic Cardijn articles on this website.
Triples
The three truths: Faith, experience and pastoral method
See, judge, act
Serve, educate, represent
By, with and for young workers
Do before, do with, do after
Formation, action, organisation
Life, milieu, mass
Work, family, leisure
Divine origin, divine mission, divine destiny
Doubles
Temporal and eternal
Conscious and responsible