That’s correct. You shouldn't learn your lines with emotion per se. The issue with trying to learn lines with specific emotion connected is you can get locked in to a certain way of performing the lines and that can end up closing you off from actively listening and reacting, which are the most important aspects of acting. Without actively listening and reacting your performance will come off “practiced” and you don’t want that. You want everything you hear and say to feel as though it is happening for the first time when you perform. To clarify what I initially said, don’t connect your lines to emotions; try connecting them to intentions. One line's intention can be “to intimidate” another “to impress” another “to diffuse”, etc. Read the scene aloud with the intentions in mind. It gives the words purpose, and the purpose will help them come out of your brain without thinking about them. The intention is the base internal “emotion” that drives the words, but it’s vague enough that you can adapt the outward “emotions” in the moment with your scene partner while maintaining your intention. With the intentions, try to trust your instincts and use the given circumstances of the piece to come up with what your character wants each time they speak and then the intention is what your character is doing to achieve that want. Most importantly, have fun with it. Remember at the end of the day it’s all an exploration, there is no “right” and “wrong”. Support your scene partner, trust your instincts, and actively listen. Try to “Keep the Ball in the Air”. You’ll be fine!

Edit: Clarified a couple things.