3 If we wish to be guarded by Him who was humbled for our sakes, and who was exalted to keep us, let us be humble. Let no one assume anything unto himself. No man has any good, except he has received it from Him who alone is good. But he who chooses to arrogate wisdom unto himself, is a fool. Let him be humble, that wisdom may come, and may enlighten him. But if, before wisdom comes unto him, he imagine that he is wise; he rises before light, and walks in darkness. What does he hear in this Psalm?
“It is but lost labour that you haste to rise up before dawn”. What means this? If you arise before light arises, you must needs lose your labour, because ye will be in the dark. Our light, Christ, has arisen; it is good for you to rise after Christ, not to rise before Christ. Who rise before Christ? They who choose to prefer themselves to Christ. And who are they who wish to prefer themselves to Christ? They who wish to be exalted here, where He was humble. Let them, therefore, be humble here, if they wish to be exalted there, where Christ is exalted....The Lord recalled the sons of Zebedee to humility, and said unto them, “Are ye able to drink of the cup that I shall drink of?” I came to be humble: and are you wishing to be exalted before Me?
The way I go, do ye follow, He says. For if you choose to go this way where I do not go, your labour is lost, in rising before dawn. Peter too had risen before the light, when he wished to give the Lord advice, deterring Him from suffering for us....But what did our Lord do? He caused him to rise after the Light: “Get behind Me, Satan.” He was Satan, because he wished to rise before Light. “Get behind Me:” that I may precede, you may follow: where I go, there you may go; and may not wish to lead Me, where you would go....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)