Purity of heart is to will one thing

the long version

Although this little book (it can be called an occasional address, yet without having the occasion which produces the speaker and gives him authority, or the occasion which produces the reader and makes him eager to learn) is like a fantasy, like a dream by day as it confronts the relationships of actuality: yet it is not without assurance and not without hope of accomplishing its object. It is in search of that solitary "individual," to whom it wholly abandons itself, by whom it wishes to be received as if it had arisen within his own heart; that solitary "individual" whom with joy and gratitude I call my reader; that solitary "individual" who reads willingly and slowly, who reads over and over again, and who reads aloud- for his own sake. If it finds him, then in the distance of the separation the understanding is perfect, if he retains for himself both the distance and the understanding in the inwardness of appropriation.