John Calvin Commentary Matthew 26:46

"Arise, let us be going: behold, he is at hand that betrayeth me." — Matthew 26:46 (ASV)

Arise, let us go. By these words He declares that, after praying, He was equipped with new strength. He had formerly, indeed, been sufficiently willing to die; but when the moment arrived, He had a hard struggle with the weakness of the flesh, so that He would have willingly withdrawn from death, if it had been permitted by His Father's will. He, therefore, obtained new strength from heaven by prayers and tears (Hebrews 5:7).

This was not because He ever hesitated from a lack of strength, but because, under the weakness of the flesh which He had voluntarily undertaken, He willed to labor anxiously, and with painful and difficult exertion, to gain a victory for us in His own person. But now, when the trembling is calmed and the fear subdued, so that He may again present a voluntary sacrifice to the Father, He not only does not retreat or hide Himself, but cheerfully advances to death.