Yielding to temptation begins in permitting the mind to waver, to be inconstant in your trust in God. If we do not choose to give ourselves fully to God then we are in darkness. When we make any reserve we are leaving open a door through which Satan can enter to lead us astray by his temptations. He knows that if he can obscure our vision, so that the eye of faith cannot see God, there will be no barrier against sin. (MB 92.1) MC VC

The prevalence of a sinful desire shows the delusion of the soul. Every indulgence of that desire strengthens the soul’s aversion to God. In following the path of Satan’s choosing, we are encompassed by the shadows of evil, and every step leads into deeper darkness and increases the blindness of the heart. (MB 92.2) MC VC

The same law obtains in the spiritual as in the natural world. He who abides in darkness will at last lose the power of vision. He is shut in by a deeper than midnight blackness; and to him the brightest noontide can bring no light. He “walketh in darkness, and knoweth not whither he goeth, because that darkness hath blinded his eyes.” 1 John 2:11. Through persistently cherishing evil, willfully disregarding the pleadings of divine love, the sinner loses the love for good, the desire for God, the very capacity to receive the light of heaven. The invitation of mercy is still full of love, the light is shining as brightly as when it first dawned upon his soul; but the voice falls on deaf ears, the light on blinded eyes. (MB 92.3) MC VC