When it comes to the innermost essence of a person, there are several synonymous phrases that can be used instead of "inmost souls". Some of these include "deepest desires," "core beliefs," "heartfelt convictions," "innermost thoughts," "intimate feelings," "personal convictions," "private emotions," and "truest selves." Each of these phrases captures the idea of what exists at the core of our being, something that is often hidden from the outside world. By using these synonyms, we can appreciate the complex and intricate nature of the human experience and the depth of our individuality.