A.T. Robertson Commentary Matthew 14:33

"And they that were in the boat worshipped him, saying, Of a truth thou art the Son of God." — Matthew 14:33 (ASV)

Worshipped him (προσεκυνησαν αυτω). And Jesus accepted it. They were growing in appreciation of the person and power of Christ from the attitude in 8:27. They will soon be ready for the confession of 16:16. Already they can say: "Truly God's Son thou art." The absence of the article here allows it to mean a Son of God as in 27:54 (the centurion). But they probably mean "the Son of God" as Jesus was claiming to them to be.