Under the influence of constant and concentrated religious thought, not only is the reason liable to give way--which is not our theme--but, alternatively, the nervous system is apt to fall into many a form of trance, the phenomena of which are mistaken by the ignorant for Divine visitation. The weakest frame sinks into an insensibility profound as death, in which he has visions of heaven and the angels. Another lies, in half-waking trance, rapt in celestial contemplation and beatitude; others are suddenly fixed in cataleptic rigidity; others, again, are dashed upon the ground in convulsions. The impressive effect of these seizures is heightened by their supervention in the midst of religious exercises, and by the contagious and sympathetic influence through which their spread is accelerated among the more excitable temperaments and weaker members of large congregations. What chance have ignorant people witnessing such attacks, or being themselves the subjects of them, of escaping the persuasion that they mark the immediate agency of the Holy Spirit? Or, to take ordinarily informed and sober-minded people,--what would they think at seeing mixed up with this hysteric disturbance, distinct proofs of extraordinary perceptive and anticipatory powers, such as occasionally manifest themselves as parts of trance, to the rational explanation of which they might not have the key? In the preceding letter, I have already exemplified, by the case of Henry Engelbrecht, the occurrence of visions of hell and heaven during the deepest state of trance. No doubt the poor ascetic implicitly believed his whole life the reality of the scenes to which his imagination had transported him.