Most of us understand that when we judge someone, or someone judges us, it is a negative emotional experience. As a result, we naturally want to avoid being judgmental, but this gets confusing when we feel we have to suppress thoughts that could actually be offering us guidance. For example, we may meet someone new and suppress a negative feeling about them, thinking that we don’t want to fall into the trap of being judgmental. Later, though, it may turn out that paying attention to that thought could have helped us take care of ourselves or someone else. 
It is important to learn to distinguish inner guidance, and having an opinion, from judgment, otherwise we run the risk of not listening to our intuition and not allowing ourselves to form opinions. Inner guidance and opinions both help us to interact more intelligently in the world, so we don’t want to throw them out in an effort to avoid being judgmental. Our intuition usually makes itself known to us in a flash, and often has a physical component—a flutter in our stomachs, sweaty palms, or a chill. When we use this information to help us navigate a situation, we always benefit. Similarly, having an opinion about a person or an idea allows us to converse about it in a focused way with intention. Listening to our intuition and forming opinions are both positive outcomes of our ability to interpret the information that comes our way.
When we make a judgment, on the other hand, we attempt to have a final say on whether someone or something is inherently good or bad. Judgments close us down instead of opening us up; opinions have a lighter quality and are amenable to change. Once a judgment has been made, there is no more conversation or consideration, whereas opinions invite further debate. Intuition guides us from moment to moment, but, unlike judgment, never makes a final decree. In other words, it is only healthy to be open to the information we receive and to allow ourselves to process that information. As long as we stay open and fluid, we can trust that we have not fallen prey to the trap of judgment.
nicely put. open and fluid vs, closed and static. stay in touch with your feelings, your intuition is what guides them and the warning signs (or positive affirmations) they send you as physical senses are never wrong. only our interpretations of them or choosing not to accept them is what causes us trouble. i just wanted to add to what you say here so well that if you make your goal understanding, and not proving, opinion helps create the kind of dialogue and leads to the kind of growth you talk about, and a free exchange of mindful opinion is how we can help one another grow through understanding. i like to start from "i don't know" rather than with "i know."