Charles H. Spurgeon on Psalms 18:18

"They prevented me in the day of my calamity;" i.e., came on me suddenly, unawares, when I was unprovided and helpless, and must have destroyed me had not God upheld and supported me when I was in danger of perishing. God was to the psalmist (Heb.), for a staff to support him. What the staff is to one that is ready to fall, the means of recovering and preserving him; that was God to David in the time of his extremity. For he several times preserved him from Saul, when he, David, thought his destruction by him almost unavoidable. See 1 Samuel 23:26, 27. —Samuel Chandler.