In logic, premise or syllogism is either valid or it isn't. It is a condition of being. It does not need to be validated per se. read more
If one of your premises is not true, or your argument is not valid, your argument is not sound. Still, if you phrase it as “your logic is sound”, it seems more like a general statement that equates to, “your reasoning is sound”. This just simply means someone believes that your reasoning is good. read more
Sound is often used to mean sure, or clear. Sound reasoning is simply reasoning that makes sense, and follows some sort of logic. Sound reasoning means logical reasoning. read more