No it isn't. It's like saying if you don't feel anything at all then you just stop lifting weights the way you're doing it. A strain in your muscles. A little sweat. A little worn out. Anything.
And if you don't feel anything, then maybe change your routine. Increase your reps. Increase your weight.
Because otherwise, what exactly are you doing? Just banging out some formula and hoping for the best? Hoping the happy story that your teacher told you someday comes true? That's dumb.
The results are the guide. You feel your way along with that feedback.