Pranams Bhairoji

Thank you very much for your guidance. Havan means homam then in my language (telugu). Everyday doing homam is very difficult for me actually it's impossible by my circumstances. After chanting 1080 times can i chant mantra 108 times and do homam in my mind? Is it equally valid when compare to normal homam we do?

Who is Guru for sriaurobindo and sriram? Please tell me when can we find Guru?

Sesirekha.