Logic is the systematic study of the principles of correct reasoning and valid inference. One will use logic in many facets, such as in philosophy, science, linguistics and mathematics. The investigation that logic undertakes is of approximate knowledge in the natural world. Some philosophers may classify logic as a sub-division of epistemology for this very reason, while others think of logic as a scientific study of argumentation. But to consider the premises in a logical argument as necessarily true, they need to have some relation to "reality," as far as we know it to exist. So, other systems, like science and philosophy and so on, could give the facts for the premise to be considered true. If there's no facts or evidence to support the premise, then the argument is built on faulty grounds.
This is why I think logic is not truth in and of itself. But that isn't to say that logic is not a necessary process to find approximations of our reality. Also, I guess, depending on how one defines "truth," an emotion to X would be considered real, even if X is not real.
(Woo, I have 69 posts. **types seductively**)
EDIT: I forgot to put "principles" in this post. I don't want to muddle the definition.