Does a court need to give Sua sponte a cautionary instruction that testimony pertaining to the flight be viewed with caution?

If the flight be construed to be an admission by conduct as the defendant contends, it was not necessary for the court to give Sua sponte a cautionary instruction that testimony pertaining thereto should be viewed with caution. The cautionary instruction as to admissions pertained to oral [271 Cal.App.2d 624] admissions. The reason for the rule was that oral statements not recorded or reduced to writing can be easily twisted or misunderstood. (People v. Gardner (1961) 195 Cal.App.2d 829, 832, 16 Cal.Rptr. 256.) Such is not true as to conduct. 'When the reason of a rule ceases, so should the rule itself.' (Civ. Code, 3510.)