It is the object of the author to unmask that secret _infidelity of the heart_, of which St. Paul gives admonition, in his epistle to the Hebrews--“Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God”--and he has well accomplished it. His pen seems an Ithuriel’s spear, to strip the subtle fraud, which he pursues with singular skill, of all its multiplied disguises. His page teems with illustrations, the rarest, the aptest, and the most beautiful, of his important theme. It is impossible, plain as the truths are which he speaks, to be offended with him, from the pure benevolence which is felt to be his prompter; and, such the vein of keen, but half repressed and silent, humour which pervades the book, that, once taken up, it is impossible to lay it down till it is finished. We began to mark the passages which, for the thought or the expression, struck us, as we read, by turning down the leaf; and the volume lies before us, increased by half its thickness. To review it, as it deserves, is not within the compass of our craft. Not to commend it to universal notice, would be to do our readers an unpardonable injustice. There was great want of such a book, which, by its engaging character, should tempt men to become acquainted with themselves--which should expose the vanity and recklessness with which many, “who profess and call themselves Christians,” are running the giddy round of self-delusion and self-dependence--which should bring home the thoughts of men to God and their own hearts; and induce them, in the noise and bustle of this restless age, to commune with themselves, in their own chamber, and be still. Such a book is here furnished--unpretending and artless, yet sagacious, powerful and persuasive--as fearless as the Baptist, yet with the Evangelist’s gentleness and meekness--deep, searching and thorough, yet clear and intelligible to the simplest reader--wearying none with its minuteness or prolixity, offending none with its abruptness or severity, delightful to all for its ease, its perspicuity and its amenity.--_Missionary._ * * * * *