Yes that is 100% true that the time which has been passed will never come back what ever the condition is.
Everyone in this world did some thing wrong he want to change and he repent alot what he did but it is all in vain to it is better to forget about the past and start living in present,

Some mistake don,t in past can,t be changed but you can improve them .

Thanks for sharing this post my friend have a nice day @javybar