The merciful shall find mercy, and the pure in heart shall see God. Every impure thought defiles the soul, impairs the moral sense, and tends to obliterate the impressions of the Holy Spirit. It dims the spiritual vision, so that men cannot behold God. The Lord may and does forgive the repenting sinner; but though forgiven, the soul is marred. All impurity of speech and thought must be shunned by him who would have clear discernment of spiritual truth. (RC 308.3) MC VC