The departure of the angel was as evident to Cornelius as his coming. Therefore he had no doubt that it was truly an angel of God who had appeared to him.
He undoubtedly knew from the Jews examples of heavenly beings appearing to men. He knew how reverently one must respond to them, and this is what he did.
He calmly answered the angel's call and humbly listened to his words, with full readiness to carry them out. And immediately, as soon as the angel departed from him, he called two servants and a more honorable soldier.
He told them what had happened to him and sent them to Joppa. Evidently those chosen were worthy of trust. They were also generally worthy to be told so great and precious a mystery of life.
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This mystery concerned the most hidden depths of Cornelius's spiritual treasury. One may think that they too shared, to some degree, the views by which Cornelius lived and was guided.
This applies especially to the soldier, whom the writer of Acts not without reason calls "pious"; cf. verse 2.
"Notice the absence of arrogance. He did not say, 'Summon Peter for me.' Instead, he told them everything, so that by this he might move him to come to him. He considered it improper to summon him by virtue of his own authority. Therefore he told them."