Vedic Knowledge: Reconciling Contradictions

                                                                  Q. We are taught to accept Guru as he represents the disciplic line. I've read and heard that guru always speaks without deviation from the previous Acharya in the line. I was wondering about the difference between Sri Madhvacharya and Sri Chaitanya Mahaprabhu. Specifically as it pertains to our line, and the question of authenticity.

                                                                  Q. 1. How do I make sure that my gratitude for my spiritual master and those guiding me day-by-day in my spiritual life keeps on increasing, and does not become interrupted?

                                                                  Below is an answer I gave to a similar question asked by someone else about hearing from a single source.

                                                                  Digest 227

                                                                  Q. I have heard that while killing Putana, Krishna closed His eyes. On this, various spotless Vaishnava Acharyas have written commentaries which differ from each other. One Acharya writes that Krishna closed His eyes so as not to see the heinous face of the infant-killer. Some other Acharya writes that because He was killing a female, He closed His eyes...  and so on. (Krishna Book, Ch 6) So, how to understand this phenomenon?

                                                                  Q. In Bhagavad Gita, Krishna claims Himself to be the only supreme Lord. But in Siva Gita (which is in Padmapurana) Siva claims that He is the only supreme Lord. Various puranas praise various Lords to be the supreme absolute truth. This is very much confusing and this suggests the possibility of scriptures being man made. It is obvious that Bhagavad Gita or Srimad Bhagavatam are not special since Siva Gita and other puranas can sufficiently counter the claims made by the above said scriptures. So how to know who the Almighty is?

                                                                  There are stories about Christian mystics who fell victims to demons while thinking that they communicate with God. For example, during deep prayers and austerities, some of them smelled heavenly fragrance and a divine being appeared to them, speaking seemingly about spiritual truths, but in fact that "angel" was misleading that ardent Christian mystic. Is something like that possible in Vaishnavism? How to recognize who is on the other side of the line?