Charles H. Spurgeon on Psalms 89:43

Thou hast also turned the edge of his sword, that it cannot do execution as it has done; and what is worse, thou hast "turned the edge" of his spirit, and taken off his courage, and hast not made him to stand, as he used to do, in the day of battle. The spirit of men is what the Father and Former of spirits makes them; nor can we stand with any strength or resolution, farther than God is pleased to uphold us. If men's hearts fail them, it is God that dispirits them; but it is sad with the church when those cannot stand that should stand up for it. —Matthew Henry.