Sarah imagined that her contemptuous incredulity was only known to herself: but the heavenly visiter instantly detected it, and appealed to Abraham on its impropriety. Possibly the reason of addressing Abraham, rather than calling the culprit herself to an account, was to inflict the severer reproof. Ah! how vainly do we strive to conceal the secret thoughts of the mind from the knowledge of God! His eyes, which run to and fro through the earth, penetrate through every disguise, and perfectly discern every inward motion as well as every outward action. We live every moment--in the darkest midnight as well as at the brightest noon--in the full blaze of Omniscience. "O Lord, thou hast searched me and known me: thou knowest my down-sitting and mine up-rising; thou understandest my thoughts afar off." Incapable of enduring this exposure, the criminal now rushes from her concealment, and boldly calls out, "I laughed not." This was a direct falsehood, dictated by apprehension; and it was confronted by the instant retort of him who knew her heart: "Nay, but thou _didst_ laugh." It is possible that Sarah had some mental reservation, when she so flatly denied the assertion of the angel: she might persuade herself that she did not absolutely laugh, but only smiled, or felt contempt; but whatever mode she might have adopted to explain away her conscious guilt, it was unavailable, as every such unworthy subterfuge must always prove. We cannot help remarking the danger of the least deviation from the path of rectitude. One sin prepares the way for the commission of another; one step over the edge and boundary of uprightness may lead us down a precipice, and plunge us into a fatal series of crimes. We have already seen an exemplification of this remark; and it is more strikingly illustrated in the present transaction. Curiosity brought her to the door, where she was soon betrayed into unbelief: detection soon produced a fear of censure; this dread produced a ridiculous attempt at concealment and self-justification; and the pride of her heart issued in exciting her to a deliberate falsehood. Notwithstanding her incredulity, however, Sarah shall bear a son, to be the spring of innumerable blessings to her posterity. Thus infinite goodness overrules the perverseness of his people, as well as the wrath of sinners, ultimately to promote his own designs.