"Of course, every good deed done for Christ's sake gives us the grace of the Holy Spirit, but prayer gives us this grace most of all, for it is always at hand, as an instrument for acquiring the grace of the Spirit. For instance, you would like to go to church, but there is no church or the service is over; you would like to preserve your virginity, but you have not the strength to do so because of your temperament, or because of the violence of the wiles of the enemy which because of your human weakness you cannot withstand; you would like to do some other good deed for Christ's sake, but either you have not the strength or the opportunity is lacking. This certainly does not apply to prayer. Prayer is always possible for everyone, rich and poor, noble and humble, strong and weak, healthy and sick, righteous and sinful."
- St. Seraphim of Sarov. "The Aim of the Christian Life." On Acquisition of the Holy Spirit, S.A. Nilus, ed., CreateSpace Independent Publishing Platform, 2014, p. 19-20.