I am also commanded to present myself for practical and joyful service, and I am told that I must believe such a sacrifice is acceptable because whatever touches the Divine altar is holy. Now, I can be quite sure as to my compliance with these demands, and my willingness to live as a sanctified soul ought to live. I know whether or not in these things I have done my part; and, if I know that I have, I can then reasonably trust God or reckon on Him to do His part. That is what Paul calls 'a good conscience toward God', and there is no presumption in such a conclusion. If we turn to John's Epistle we shall see how plainly he puts the truth about assurance. 'If', says the Apostle, 'our heart condemn us, God is greater than our heart, and knoweth all things'; but 'if our heart condemn us not, then have we confidence toward God'. Without this conscious sincerity it is useless to pray for the blessing, for God cannot sanctify us whilst we are clinging to any known wrong or compounding with some doubtful habit or folly. If, on the other hand, we are conscious that we have no reserves, and accept by faith the cleansing Blood as the cure for our heart's plague, we may with all reasonableness say, 'I have the testimony of my own spirit'. 2. Let us look at the second class of evidence, namely, _the testimony of the Spirit of God_--the assurance of the Holy Ghost. If we are to be quite certain about the important things in relation to the soul, we must have the expression of God's mind and approval. Nothing is made clearer in the Apostolic writings than the fact that it is our blessed privilege to have this Divine testimony. Paul not only tells us that 'the Spirit beareth witness with our spirit, that we are the children of God', but speaks of the marvellous manifestations of God in saved souls in subsequent revelations: 'We have received the Spirit, which is of God; that we might know the things that are freely given to us of God.' On first thought we might say, perhaps, that the gift would speak for itself. But the Lord goes beyond that by giving us not only the blessing itself, but also the Spirit to assure us that we have got the blessing. John is on the same line when he says repeatedly about those spiritual blessings, 'we know', 'we know that we know', and the secret of sureness is made clear, 'we know by the Spirit which He hath given unto us'.