“…you may well dream, trusting in yourself, about leading a Christian life without any help from above — as long as your soul is calm. But when the evil that lies in the depths of the heart is roused up like dust by the wind, then in your own experience you will find the condemnation of your own presumption. When thought after thought, desire after desire — one worse than the other — begin to disturb the soul.”
(St Theophan the Recluse in ‘Path to Salvation’)