Exodus 4:10

Vulgate: Obsecro, Domine, non sum eloquens ab heri et nudiustertius; et ex quo locutus es ad servum tuum, impeditioris et tardioris linguae sum.

TO THE MOST REVEREND AND MOST ILLUSTRIOUS LORD HENRY FRANCIS VAN DER BURCH, ARCHBISHOP AND DUKE OF CAMBRAI, PRINCE OF THE HOLY ROMAN EMPIRE, COUNT OF CAMBRAI. — Quoted as Moses declining God's call to leadership, paralleled to Basil's and Van der Burch's reluctance to accept high office
"I beseech you, Lord, I am not eloquent, neither heretofore nor since you have spoken to your servant; but I am slow of speech and of tongue: I beseech you, Lord, send whom you will send."