Charles H. Spurgeon on Psalms 6:3

"O Lord, how long?" Out of this we have three things to observe; first, that there is an appointed time which God hath measured for the crosses of all his children, before which time they shall not be delivered, and for which they must patiently attend, not thinking to prescribe time to God for their delivery, or limit the Holy One of Israel. The Israelites remained in Egypt till the complete number of four hundred and thirty years were accomplished. Joseph was three years and more in the prison till the appointed time of his delivery came. The Jews remained seventy years in Babylon. So that as the physician appointeth certain times to the patient, both wherein he must fast, and be dieted, and wherein he must take recreation, so God knoweth the convenient times both of our humiliation and exaltation. Next, see the impatiency of our nature in our miseries, our flesh still rebelling against the Spirit, which oftentimes forgetteth itself so far, that it will enter into reasoning with God, and quarrelling with him, as we may read in Job, Jonas, etc., and here also of David. Thirdly, albeit the Lord delay his coming to relieve his saints, yet hath he great cause if we could ponder it; for when we were in the heat of our sins, many times he cried by the mouth of his prophets and servants, "O fools, how long will you continue in your folly?" And we would not hear; and therefore when we are in the heat of our pains, thinking long, yea, every day a year till we be delivered, no wonder is it if God will not hear; let us consider with ourselves the just dealing of God with us; that as he cried and we would not hear, so now we cry, and he will not hear. A. Symson.