Since Christ is the light of the world, those who do not see Him, who do not believe in Him, are all most certainly blind. Conversely, all who strive to practice the commandments of Christ walk in the light; they confess Christ and venerate and worship Him as God. Whoever confesses Christ and regards Him as his Lord and God is strengthened by the power of the invocation of His name to do His will. But if he is not strengthened, it is evident that he confesses Christ only with his mouth, while in his heart he is far from Him.
From the book
Councels from the Holy mountain
Selected from the letters and homilies of Elder Efraim of Arizona
sub 3 Prayer
Selection of passages from the book by Silviu Podariu