“The new situation must be created, in which it is possible to believe on Jesus as God incarnate; that is the impossible situation in which everything is staked solely on the word of Jesus. Peter had to leave the ship and risk his life on the sea, in order to learn both his own weakness and the almighty power of his Lord. If Peter had not taken the risk, he would never have learnt the meaning of faith. Before he can believe, the utterly impossible and ethically irresponsible situation on the waves of the sea must be displayed. The road to faith passes through obedience to the call of Jesus. Unless a definite step is demanded, the call vanishes into thin air, and if men imagine that they can follow Jesus without taking this step, they are deluding themselves like fanatics.”
― Dietrich Bonhoeffer, The Cost of Discipleship