I think it might be different for everyone according to whatever your own personal weakness tendencies are . I wonder if it is when we are at the crossroads between chosing between listening to God or the enemy, and leaning toward what the enemy whispers in our ear. But God can strenthen us in any weakness. Nothing can stand against God, nothing! He promises to strengthen us in our weakness. What a great question to ponder, for there are more aspects to it than what I said! God Bless You Yaright!