Unless the spiritual life is based on a sound psychology it will never be secure from illusion and misspent energy. Those for example who fancy the soul to be some strange spark burning within the massy flesh, which threatens to extinguish the fire by the melting of excessive fat, will plunge into mortification of the flesh with the ardour and the malpractice of a manichee. Those who think the soul is exclusively mind will turn to education and culture as to infallible ways of salvation. The concentration of interest upon the soul alone leads to the unbalanced self-consciousness which we have already considered. Hilton's skilful balance between the subjective and the objective, the self-knowing and the God-knowing in the spiritual life guarantees that the foundation of his scale is perfectly sound; and if we look more closely into his subjective doctrine we shall find how happily he holds the balance.