St. Theophan the Recluse:

. . . if we undertake to cure ourselves, then we will be able to do something about it.

“If [the disease of sin] is natural, then it cannot be cured. Thus it would remain always, no matter how hard you worked to rid yourself of it. If you accept this thought, you will lose heart, and say to yourself: this is how it is. For this is that woeful despair, which, once it has been introduced into people, they have given themselves over to lasciviousness, to work all uncleanness (Ephesians 4: 19). “I shall repeat again: Maintain the conviction that our disorderliness is not natural to us, and do not listen to those who say, ‘It is no use talking about it, because that is just how we are made, and you cannot do anything about it.’ That is not how we are made, and if we undertake to cure ourselves, then we will be able to do something about it.”

St. Barsanuphius of Optina:

Prayer in church is important. The best thoughts and feelings come in church, yes, and the enemy attacks more violently . . .

St. Barsanuphius of Optina“Prayer in church is important. The best thoughts and feelings come in church, yes, and the enemy attacks more violently in church, but with the sign of the Cross and the Jesus Prayer, you drive him away. It is good to stand in some dark corner in church and to pray to God. “Let us lift up our hearts!” the priest exclaims, but our mind often creeps along the ground, thinking about indecent things. Fight against this.”

+ St. Barsanuphius of Optina,