1. Understanding that "you're using too much strenght" is a very stupid thing to say/think.
2. Learning to think in terms of patterns and concepts rather than technique.
3. Learning to not lose sleep over bad days in training.

1. Concept of aliveness.
2. Understanding that martial arts is not "special" in regards how it should be learned but motor skills for sport game like any other.
3. It's never late to work on your mobility and other attributes.

1. Relax and play the game.
2. Enjoy getting smashed.
3. Age is just a number.

Those are good ones

1. Be patient.
2. Have fun. Don't be afraid to try new techniques.
3. Don't panic and keep breathing.

1. Relax. No, more than that.
2. Don't roll with people much bigger than you.
3. If you have a kimura grip, don't let it go

1. Don´t strecht, when you getting stacked.
2. Don´t go easy/hard on someone and let them do everything just because I have another belt.
3. Try new things, like looking for a Submission even if you don´t have the position.

1. Your training partners are your friends, not your competitors. Save it for the tournament.
2. If your training partner taps you out, be legitimately happy for them, make a mental note, and fix your mistake.
3. laugh and enjoy the ride.

1. Understand the "why?", before the "how?"
2. Everything should be a game.
3. Mutual welfare & benefit.

(4). Nasal breathing. Or in though nose, out through mouth.

1. Understanding that the higher belts are not demigods. Just because a person has an elite rank, doesn't mean their information (even on the mats) is correct. Figuring stuff out yourself is often more valuable than having somebody else's solution handed over to you, and thus train more towards being able to "figure it out" rather than collect pre-written answers. Even when you're still a lower rank.
2. Starting to instruct classes.
3. Accepting the fact that nobody other than yourself truly gives a flying fuck about your performance, that your jiu-jitsu achievements are completely meaningless outside your own head, and that we're all gonna die, so fuck it, try a leglock.

Some great ones on this thread already.

(1) Break it down.
(2) Break it down even more.
(3) Break it down to the level where you analyze every inch of movement.

Yes, because I'm a totally full and whole deity now.

1. Rolling with 20 year olds sucks and should be avoided.
2. Just because (almost) every instructor says that their way of doing a particular technique is the best, doesn't necessarily make it so.
3. I won't ever be good at JJ, so try not to worry about it.

1. If it's too hard, then it's not efficient.
2. Everyone has bad days.
3. Basics, always the basics.

Ooo, I like that! Very nicely put. :D

1 Enjoy, it should be fun
2 It's about connection (physically and socially)
3 Don't give away underhooks (hey, I am a beginner, this one was golden for me :-) ).

1. If you're using strength and it doesn't work, you were not using enough!

How would you think about/phrase this to make it less stupid?

If your goal is to simply make the technique 'work', then strength can get you there. If your goal is to actually get better at performing the technique, then more strength won't help, it can do the opposite.

Words to live by lol