What was the nature of the advice that Maharaj gave to his devotees? Was it focused on complex spiritual philosophy?

Maharaj's approach to teaching was primarily ethical rather than focused on deep philosophical discourse. As explained in Chapter 0, he did not openly lecture on profound Vedanta subjects or the Upanishads. His method was to first purify the disciple's ground before planting the seed of knowledge, which is described as the traditional practice of a Sadguru. Consequently, his verbal advice consisted of general ethical principles. The text also importantly notes that the advice received through direct experience with him was considered infinitely more valuable by devotees and was the source of their highest benefit.