This would depend the context of the conversation. Is this a friend who just needs to vent their feelings? If so, listen attentively and be present for your friend. Or is this a classmate who is involved in debating a topic with you in class? In this case, you can certainly express your opinion and maintain a professional level of discourse. Is this a family member who is sharing their views on a controversial geo-political issue? This situation might require some finesse in order to agree to disagree. Regardless of the specific context, it is important to maintain decorum in the words we use and the approach we have when disagreeing with someone. The Qur’an tells us to “Argue in a way that is better and most gracious (16:125),” reminding us to use the best of manners and wisdom when having a conversation. Sometimes, it is wiser to remain silent or passive – neither supporting nor contradicting. At other times, it is necessary to set the facts straight. A conversational tool that you can consider using is “Yes And.” When trying to express disagreement or when trying to diplomatically add your ‘two cents,’ interject in the conversation with “yes, and…”. This shows respect for the ideas the person was sharing, while allowing yourself to politely offer your own ideas.