Three reasons to reject a guru.
Kula-gurus (family gurus) adjust to the requests of their customers, give out whatever mantras they want and get paid for it.
The qualifications of kanishtha-adhikari, madhyama-adhikari and uttama-adhikari.
The 3 types of kanishtha-adhikari, madhyama-adhikari and uttama-adhikari.
The definition of a sadhaka and a siddha.
Bilvamangala Thakura is a perfect example of a vraja-raganuga sadhaka.