No one should be surprised at the difficulty of faith, if there is some part of his life where he is consciously resisting or disobeying the commandment of Jesus. Is there some part of your life which you are refusing to surrender at his behest, some sinful passion, maybe, or some animosity, some hope, perhaps your ambition or your reason? ... How can you hope to enter into communion with him when at some point in your life you are running away from him?
Dietrich BonhoefferIf there is no element of asceticism in our lives, if we give free rein to the desires of the flesh (taking care of course to keep within the limits of what seems permissible to the world), we shall find it hard to train for the service of Christ. When the flesh is satisfied it is hard to pray with cheerfulness or to devote oneself to a life of service which calls for much self-renunciation.
Dietrich Bonhoeffer