Isaiah 6:5
When Isaiah beheld the glory of the Lord, the overwhelming conviction of his sinful state caused him to cry out 'Woe is me . . . I am a man of unclean lips'. Once he saw and confessed his need for holiness, he received his cleansing, and ultimately his Calling.  Part 1 of this sermon deals with 65 Sins of the Tongue — that little organ that causes so many to sin.