Being Intense but not becoming Extremist

It means you should be doing Everything with Intensity rather than becoming an extremist. When you become an extremist your whole focus shifts onto one thing only and you aren't even bothered about anything else and eventually miss out on so many other things you could have done simultaneously. While if you do things with high intensity then you can do so much in the same time. See our master don't tell us do 12hrs of meditation, instead he tells us to do 20mins of intense breathing. I always used to do things to the extreme and so missed a lot which I would have done otherwise. So not a good idea doing things being an extremist.