Sai says, the glory of a Guru is greater than that of God himself!
Just like the importance of a doctor is more than the medicine. A medical store is full of medicines, but can we consume any of them, without a doctor diagnosing our problem and then prescribing one suited for our illness? No. Just like the doctor has knowledge about his subject, so is the guidance of a Guru towards devotion to God and accordingly achieving the goal of our lives!