Of all knowledge, that which we learn with the greatest difficulty, and dwell upon the most reluctantly, and forget the most readily, is the knowledge of our own hearts. The man of the world never, in the Christian's meaning of the phrase, knows himself; he has no line to fathom, no gauge to measure, no eye to see, no heart to conceive, the undiscovered depths of iniquity which lie within. Even the child of God is ofttimes ignorant of this important knowledge, or learns it not, except by "line upon line, precept upon precept," failure upon failure, sin upon sin, it is taught him by the unerring spirit of wisdom and truth.

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