Matthew Poole and continuators on Psalms 27:13

13. I had fainted , unless I had believed to see the goodness of the LORD in the land of the living .

These words are added to compleat the Sence: For the Speech is abrupt and Imperfect, as is very usual, not only in the Holy Scripture, but in many other Authors, in all vehement Passions or Commotions of mind, such as David was in at this time. Having declared what perfidious and cruel Enemies, did now assault and encompass him, he now subjoyns what impression the Thoughts thereof made upon him, and speaks like one that wanted Words to express, how sad and desperate his Condition would have been, if he had not been supported by Faith in God's promises.

To enjoy (which is oft expressed by seeing) the Mercy which God hath promised me.

(i. e.) In this World, which is oft so called, as Iob 28. 13. Psal. 52▪ 5. and 116. 9. and 142. 5. Isa. 38. 11. and 53. 8. Ier. 11. 19. Ezek. 32. 32. and is opposed to the Grave, which is the place of the Dead. And David was thus earnestly desirous of this Mercy in this Life, not because he placed his Portion in these things, which he so solemnly Disclaims, Psal. 17. 14. but because the Truth and Glory of God, were highly concerned in making good the Promise of the Kingdom made to him.