The body is a slave, the soul a sovereign, and therefore it is due to Divine mercy when the body is worn out by illness: for thereby the passions are weakened, and a man comes to himself; indeed, bodily illness itself is sometimes caused by the passions.
Seraphim of SarovWhen a man receives something Divine, in his heart he rejoices; but when he receives something diabolic, he is disturbed. The Christian heart, when it has received something Divine, does not demand anything else in order to convince it that this is precisely from the Lord; but by that very effect it is convinced that this is heavenly, for it senses within itself spiritual fruits: love, joy, peace, and the rest (cf. Gal. 5:22).
Seraphim of SarovThat I am a monk and you are a layman is of no importance ... rather that we are both in the light of the Holy Spirit ... Acquire peace, and thousands around you will be saved.
Seraphim of SarovThe reading of the word of God should be performed in solitude, in order that the whole mind of the reader might be plunged into the truths of the Holy Scripture, and that from this he might receive warmth, which in solitude produces tears; from these a man is wholly warmed and is filled with spiritual gifts, which rejoice the mind and heart more than any word.
Seraphim of SarovIn spite of our sinfulness, in spite of the darkness surrounding our souls, the Grace of the Holy Spirit, conferred by baptism in the name of the Father and the Son and the Holy Spirit, still shines in our hearts with the inextinguishable light of Christ ... and when the sinner turns to the way of repentance the light smooths away every trace of the sins committed, clothing the former sinner in the garments of incorruption, spun of the Grace of the Holy Spirit. It is this acquisition of the Holy Spirit about which I have been speaking.
Seraphim of Sarov