There are no successes to be guaranteed and no set orders to be given to individuals, so long as we follow the methods of empirical philosophy.
 William James, The Varieties of Religious Experience (1902). copy citation

Context

“But in our Father's house are many mansions, and each of us must discover for himself the kind of religion and the amount of saintship which best comports with what he believes to be his powers and feels to be his truest mission and vocation. There are no successes to be guaranteed and no set orders to be given to individuals, so long as we follow the methods of empirical philosophy. This is my conclusion so far. I know that on some of your minds it leaves a feeling of wonder that such a method should have been applied to such a subject, and this in spite of all those remarks about empiricism which I made at the beginning of Lecture XIII.223 How, you say, can religion, which believes in two worlds and an invisible order, be estimated by the adaptation of its fruits to this world's order alone?” source