Many people seek heaven after death. What did Sai's teachings say about the concept of heaven and should we strive for it?

According to the teachings in Chapter 37, the pursuit of a heavenly abode is misguided. The text questions the desire for a place attained through difficult sacrifices that ultimately lacks the remembrance of Lord Narayana. It is described as merely a place for sensual enjoyment, which is ultimately no different from earthly pleasures. Instead of seeking a separate heaven, the teachings point to a divine heavenly state that can be realized here. As described in Chapter 37, this state is the Vairaj or Cosmic Self-form, which is free from mental grief, disease, worry, and the fear of death. This is achieved not by going to another place, but by crossing the 'nooses of death'—adharma, ignorance, anger, and hatred.