"Look within" is a phrase that refers to self-reflection and introspection. There are several synonyms that can be used to convey the same idea. "Soul-searching" is one such phrase and it implies the act of looking inward to find answers to one's problems or questions. "Self-examination" is another substitute that could refer to a process of introspection or self-discovery. "Introspection" is yet another synonym for "look within" and it denotes the act of examining one's feelings, thoughts, or sensations. Additionally, the phrase "self-discovery" also carries the same connotation, which involves reflection, exploration, and acknowledgement of one's own values, beliefs, and behaviors.