Charles H. Spurgeon on Psalms 6:1

Whole Psalm. David was a man that was often exercised with sickness and troubles from enemies, and in all the instances almost that we meet with in the Psalms of these his afflictions, we may observe the outward occasions of trouble brought him under the suspicion of God's wrath and his own iniquity; so that he was seldom sick, or persecuted, but this called on the disquiet of conscience, and brought his sin to remembrance; as in this Psalm, which was made on the occasion of his sickness, as appears from verse eight, wherein he expresseth the vexation of his soul under the apprehension of God's anger; all his other griefs running into this channel, as little brooks, losing themselves in a great river, change their name and nature. He that at first was only concerned for his sickness, is now wholly concerned with sorrow and smart under the fear and hazard of his soul's condition; the like we may see in Psalm 38, and many places more. Richard Gilpin, 1677.

"Rebuke me not." God hath two means by which he reduceth his children to obedience; his word, by which he rebukes them; and his rod, by which he chastiseth them. The word precedes, admonishing them by his servants whom he hath sent in all ages to call sinners to repentance: of the which David himself saith, "Let the righteous rebuke me;" and as a father doth first rebuke his disordered child, so doth the Lord speak to them. But when men neglect the warnings of his word, then God as a good Father, takes up the rod and beats them. Our Saviour wakened the three disciples in the garden three times, but seeing that served not, he told them that Judas and his band were coming to awaken them whom his own voice could not waken. A. Symson, 1638.