'Judaism is often called the religion of reason. It is this, but it is also the religion of the soul. It recognises the value of that mystic insight, those indefinable intuitions which, taking up the task at the point where the mind impotently abandons it, carries us straight into the presence of the King. Thus it has found room both for the keen speculator on theological problems and for the mystic who, because he feels God, declines to reason about Him--for a Maimonides and a Mendelssohn, but also for a Nachmanides, a Vital, and a Luria' (M. Joseph, _op. cit._, p. 47). Used in a vague way, mysticism stands for spiritual inwardness. Religion without mysticism, said Amiel, is a rose without perfume. This saying is no more precise and no more informing than Matthew Arnold's definition of religion as morality touched with emotion. Neither mysticism nor an emotional touch makes religion. They are as often as not concomitants of a pathological state which is the denial of religion. But if mysticism means a personal attitude towards God in which the heart is active as well as the mind, then religion cannot exist without mysticism. When, however, we regard mysticism as what it very often is, as an antithesis to institutional religion and a revolt against authority and forms, then it may seem at first sight paradoxical to recognise the mystic's claim to the hospitality of Judaism. That a religion which produced the Psalter, and not only produced it, but used it with never a break, should be a religion, with intensely spiritual possibilities, and its adherents capable of a vivid sense of the nearness of God, with an ever-felt and never-satisfied longing for communion with Him, is what we should fully expect. But this expectation would rather make us look for an expression on the lines of the 119th Psalm, in which the Law is so markedly associated with freedom and spirituality. Judaism, after all, allowed to authority and Law a supreme place. But the mystic relies on his own intuitions, depends on his personal experiences. Judaism, on the other hand, is a scheme in which personal experiences only count in so far as they are brought into the general fund of the communal experience.