Does a defendant have to provide evidence of a defendant's state of mind in a civil case?

Defendant argues on appeal that the statements were not offered for the truth of the matter, but, instead, for the nonhearsay purpose of showing his state of mind. Statements offered for this nonhearsay purpose "'do not directly declare a mental or emotional state, but are merely circumstantial evidence of it,' which are 'outside the hearsay rule.'" (People v. Clark (2016) 63 Cal.4th 522, 591.) Nonhearsay state of mind evidence is admissible where the statements tend to prove state of mind circumstantially. (Id. at pp. 590-591.)