CC Ādi 12.9
sva-mata kalpanā kare daiva-paratantra
This verse describes the beginning of a schism. When disciples do not stick to the principle of accepting the order of their spiritual master, immediately there are two opinions. Any opinion different from the opinion of the spiritual master is useless. One cannot infiltrate materially concocted ideas into spiritual advancement. That is deviation. There is no scope for adjusting spiritual advancement to material ideas.