The Lord - doth go before thee - To prepare thy way, and to direct thee.
He will be with thee - Accompany thee in all thy journeys, and assist thee in all thy enterprises.
He will not fail thee - Thy expectation, however strong and extensive, shall never be disappointed: thou canst not expect too much from him.
Neither forsake thee - He knows that without him thou canst do nothing, and therefore he will continue with thee, and in such a manner too that the excellence of the power shall appear to be of him, and not of man.