Prayer is a very useful medicine, that if we don’t use it properly, and apply it to our wounds it doesn’t cure our sickness. Perseverance in sincere prayer is indeed useful and very powerful. If we had prayed to God and he listened, we should thank Him.

If he didn’t fulfil our wish we should pray for the second, third time and he will do it. Christians shouldn’t let prayer on others, but they should pray themselves in order for their wishes to be fulfilled. 

(Translated from Protosinghel Nicodim Măndiță, Învățături despre rugăciune, Editura Agapis, București, 2008, p. 60)