Abba John said, ‘I am like a man sitting under a great tree, who sees wild beasts and snakes coming against him in great numbers. When he cannot withstand them any longer, he runs to climb the tree and is saved. It is just the same with me; I sit in my cell and I am aware of evil thoughts coming against me, and when I have no more strength against them, I take refuge in God by prayer and I am saved from the enemy.’

[Apophthegmata Patrum]