Whoever puts into practice everything his spiritual father advises has his blessing; whoever does not do what he is advised does not have the blessing of his Elder here or in the other world.

Whoever puts into practice everything his spiritual father advises has his blessing; whoever does not do what he is advised does not have the blessing of his Elder here or in the other world. Whoever disregards whatever he is commanded, whoever does not regard as law the things which he is advised and does not strive to apply them out of disdain, must realize that damnation will befall him!
My child, fear the righteous Judge and be obedient to your spiritual father’s advice, for your Elder desires the salvation of your soul, whereas the devil desires to make you his own through egotism and disobedience.

Elder Ephraim of Arizona

http://elderephraimarizona.blogspot.gr/2016/05/whoever-puts-into-practice-everything.html