"All have sinned and come short of the glory of God." Rom_3:23.
Note the definitions of sin. It is an erasure or blot on the fair page of life; hence the cry, "Blot out my transgressions." Oh that God would blot out the scribblings and smudges of our later years, and bring back the fresh beauty of our youth! It is a stain on the white robe of the soul; hence the petition: "Wash me thoroughly from mine iniquity." There is but one way into the Holy City: "Blessed are they that wash their robes, and make them white in the Blood of the Lamb." It is leprosy; hence the cry, "Cleanse me from my sin; purge me with hyssop, and I shall be clean." There was special significance, then, for thee and me when Jesus reached forth His hand and touched the leper, saying: "Be thou clean."
Note the condition of forgiveness. It is confession. Transgression must be acknowledged. We must realise that sin is not only against man, but God, to whom man belongs, and who is affronted by all sin as committed directly against Himself. And our confession must not be superficial, but deep and heart-searching. We must go back to our earliest origins, to our connection with a sinful race, to our inward and hidden parts.
Note the cry for purity and righteousness of life. The clean heart has to be created, for there are no materials within us out of which it can be shaped or moulded. Eph_4:24 tells us that full provision has been made for this. We desire a "right," or steadfast spirit, which shall not deviate to the right or left, but bear straight onward to the goal. The Greek word for sin is "missing the mark." We long for a spirit that shall not be deflected. We desire a "free" or willing spirit (R.V. marg.). Yea, what a transformation is here! But it has been effected in myriads (1Co_6:11). (Source- Our Daily Walk)
Psa 51:4 “Against thee, thee only have I sinned.” The virus of sin lies in its opposition to God: the Psalmist's sense of sin towards others rather tended to increase the force of his feeling of sin against God. All his wrong-doing centred, culminated, and came to a climax, at the foot of the divine throne. To injure our fellow men is sin, mainly because in so doing we violate the law of God. The penitent's heart was so filled with a sense of the wrong done to the Lord himself, that all other confession was swallowed up in a broken-hearted acknowledgment of offence against him. “And done this evil in thy sight.” To commit treason in the very court of the king and before his eye is impudence indeed: David felt that his sin was committed in all its filthiness while Jehovah himself looked on. None but a child of God cares for the eye of God, but where there is grace in the soul it reflects a fearful guilt upon every evil act, when we remember that the God whom we offend was present when the trespass was committed. “That thou mightest be justified when thou speakest, and be clear when thou judgest.” He could not present any argument against divine justice, if it proceeded at once to condemn him and punish him for his crime. His own confession, and the judge's own witness of the whole transaction, placed the transgression beyond all question or debate; the iniquity was indisputably committed, and was unquestionably a foul wrong, and therefore the course of justice was clear and beyond all controversy.
The most important of verses:
“Purge me with hyssop.” Sprinkle the atoning blood upon me with the appointed means. Give me the reality which legal ceremonies symbolise. Nothing but blood can take away my blood-stains, nothing but the strongest purification can avail to cleanse me. Let the sin-offering purge my sin. Let him who was appointed to atone, execute his sacred office on me; for none can need it more than I. The passage may be read as the voice of faith as well as a prayer, and so it runs - “Thou wilt purge me with hyssop, and I shall be clean.” Foul as I am, there is such power in the divine propitiation, that my sin shall vanish quite away. Like the leper upon whom the priest has performed the cleansing rites, I shall be again admitted into the assembly of thy people and allowed to share in the privileges of the true Israel; while in thy sight also, through Jesus my Lord, I shall be accepted. “Wash me.” Let it not merely be in type that I am clean, but by real spiritual purification, which shall remove the pollution of my nature. Let the sanctifying as well as the pardoning process be perfected in me. Save me from the evils which my sin has created and nourished in me. “And I shall be whiter than snow.” None but thyself can whiten me, but thou canst in grace outdo nature itself in its purest state. Snow soon gathers smoke and dust, it melts and disappears; thou canst give me an enduring purity. Though snow is white below as well as on the surface, thou canst work the like inward purity in me, and make me so clean that only an hyperbole can set forth my immaculate condition. Lord, do this; my faith believes thou wilt, and well she knows thou canst.
Scarcely does Holy Scripture contain a verse more full of faith than this. Considering the nature of the sin, and the deep sense the Psalmist had of it, it is a glorious faith to be able to see in the blood sufficient, nay, all-sufficient merit entirely to purge it away. Considering also the deep, natural inbred corruption which David saw and experienced within, it is a miracle of faith that he could rejoice in the hope of perfect purity in his inward parts. Yet, be it added, the faith is no more than the word warrants, than the blood of atonement encourages, than the promise of God deserves. O that some reader may take heart, even now while smarting under sin, to do the Lord the honour to rely thus confidently on the finished sacrifice of Calvary and the infinite mercy there revealed.