Other things have triangles too - such as the 'washing up triangle' (not in school text books). Washing the dishes needs 3 things to work well too: soap, heat and friction. If you skimp on one, you need to make it up with the others!But here's one for what many Christians call our 'devotion life', or 'quiet times' - helpfully crystallised by something Graham Daniels said recently: our devotion life needs 3 things - bible, prayer ... and meditation. (The last is a big theme in the bible, but neglected in our church circles a little. I think it's done, just not talked about much; sounds too hippie.)
So in order to build a good personal relationship with the Living God, we need to read our bibles, pray, and think - that's all 'meditation' means.
If we miss out 'bible', it becomes vague Eastern nonsense - just thinking about nothing.
If we miss out 'prayer', it becomes brain-fodder - understanding what God says to us, but not bringing our thoughts and responses back to him.
If we miss out 'meditation', it becomes cold duty - we do our daily bible reading and prayer, but then job done. It's not sunk deep, and we relate no more closely to the Lord.