First of all, most do not like the thought of having an absolute standard. They want themselves, their intellect. to be the standard. They want to decide what God has said.
Second, there is no contradiction or such between the two passages: one is figurative, the other literal, both having the same sense. The metaphor used in Psalm using the word ear is that member of the body whereby we hear the commands we are to obey, therefore faith come by hearing and hearing by the word of God. You see, His Divine nature alone, made it impossible for the Son, who was co-equal with the Father, to come under the law; therefore He prepared Him another nature, in which He could be placed under submission to Him.
It is impossible that anyone should have ears of any use without having a body, and it is through the ears that instruction unto obedience is received. It is to this the Jesus made reference when, in the language of prophecy, He declared, "He wakeneth morning by morning, He wakeneth Mine ear to hear as the learned. The Lord God hath opened Mine ear, and I was not rebellious, neither turned away back" (Isa. 50:4, 5). So the figure used in Psalm 40:6 intimated that the Father did so order things toward the Messiah that He should have a nature wherein He might be free and able to be in subjection to the will of God; intimating, moreover, the quality of it, namely, in having ears to hear, which belong only to a "body."
Second, there is no contradiction or such between the two passages: one is figurative, the other literal, both having the same sense. The metaphor used in Psalm using the word ear is that member of the body whereby we hear the commands we are to obey, therefore faith come by hearing and hearing by the word of God. You see, His Divine nature alone, made it impossible for the Son, who was co-equal with the Father, to come under the law; therefore He prepared Him another nature, in which He could be placed under submission to Him.
It is impossible that anyone should have ears of any use without having a body, and it is through the ears that instruction unto obedience is received. It is to this the Jesus made reference when, in the language of prophecy, He declared, "He wakeneth morning by morning, He wakeneth Mine ear to hear as the learned. The Lord God hath opened Mine ear, and I was not rebellious, neither turned away back" (Isa. 50:4, 5). So the figure used in Psalm 40:6 intimated that the Father did so order things toward the Messiah that He should have a nature wherein He might be free and able to be in subjection to the will of God; intimating, moreover, the quality of it, namely, in having ears to hear, which belong only to a "body."
now I think when most people speak of an absolute standard, they are referring to the actual words. So if the actual words don't match, it would be considered a mistake.