Our frame; either,
1. The corruption of our natures; which God is pleased sometimes to make an argument to pity and spare men, as Genesis 8:21. So the sense is, He considereth that great and constant propension to evil which is naturally in all mankind, and that therefore if he should deal severely with us, he should immediately destroy us all. So this clause contains one motive of God's pity, and the next another. Or rather,
2. The weakness and mortality of our natures, and the frailty and misery of our condition, as it seems to be explained in the following clause, that we are but dust. So the sense is, He considereth that if he should let loose his hand upon us, and pour forth all his wrath, we should be suddenly and irrecoverably destroyed, and therefore he spareth us.