Thank Jittananto!
Jittananto: Does that mean that it is useless to perform good deeds and transfer them to apaya beings like petas (hungry ghosts) in order to alleviate their suffering?
Me: No. If a peta receives transferred merit, it means that the conditions for the manifestation of that peta’s past kamma have been met. Therefore, in this case, the peta has received the vipaka of their own kamma.
Also, we can arrange the conditions for them to get a good vipaka by giving things or merits to others (such as petas). It is a good thing to do.
What I said should be understood only in the context of sila and bhavana. Because it gives us only the direction to go. One has a responsibility to correct oneselves. And that is the meaning of it.
Thank you