Reason and Religion by William James... There is no doubt that certainty and objective evidence are good ideals, but in what light and in what imaginative setting do we find them? Therefore, with regard to the theory of knowledge, I accepted the experimental doctrine, and I believed in a practical theory, which is that we must follow our experiences and proceed in our thinking about these experiences, because our ideas and opinions do not develop and progress towards perfection except in this way, but to insist that a theory of that Theories - any theory they are - are true and cannot be invalidated or doubted. This, I believe, is a great mistake. I believe that the history of philosophy supports me in this opinion. There is only one truth that is not tainted by doubt, and that is the truth that the philosophy of doubt itself was unable to destroy. Namely, the existence of the phenomenon of feeling

ويليام جيمس ‏. هو فيلسوف وعالم نفس أمريكي، وأول معلّم يقدم دورة في علم النفس في الولايات المتحدة الأمريكية. يُعتبر جيمس مفكراً رائداً في أواخر القرن التاسع عشر، وأحد أكثر الفلاسفة نفوذاً في الولايات المتحدة الأمريكية و«مؤسس علم النفس الأمريكي»