As the title says, post smart things that your educators (teachers/professors) have said that have stuck with you.
I have one that one of my professors said last semester that has been in my head for some time now:
"You know it's a fair compromise if nobody is pleased."
"This is one model", which was almost a catchphrase of my 6th form chemistry teacher, the man who inspired me to choose chemistry for my university degree. It is quite profound, gently reminding us at intervals that science is fundamentally in the business of model-building and not of definitive truth.
In fact this is especially true of chemistry, in which, due to the hideous complexity of real chemical systems, simplifications have to be used a lot. Sometimes more than one simplified model may be required for the same phenomenon, depending on which aspect you are concerned with, e.g. Valence Bond vs. Molecular Orbital theories of bonding, or things like the formalism of oxidation states, which pretend that everything is ionised, for the sake of balancing numbers, even though it is applied to covalent compounds.
More generally, "this is one model" has given me a useful sense of perspective on many things in life.
(By the way I have also found Heisenberg's Uncertainty Principle to be another philosophically useful idea, but that's another story.)