His [Robert Blair's] opinion of Cromwell, on the contrary, was not very high. Of late the custom has been to laud the Protector, and to speak of him as a sort of demi-god"”the uncrowned king of England. But men of good judgment, who lived in his own time, and knew him, personally, did not speak of him in such flattering terms. Blair had met him at Marston-Moor; and afterwards when he came to Edinburgh, he and David Dickson and James Guthrie were sent to him on some ecclesiastical business. Cromwell made to them a fair flourish of words, shed tears on the occasion, and frequently appealed to God to witness his sincerity. When they came out, Dickson said, "I am very glad to hear this man speak as he does." "Do you believe him?" said Blair. "If you knew him as well as I do, you would not believe one word he says. He is an egregious dissembler, and a great liar. Away with him! He is a greeting devil."
Source: Thomas Witherow, Historical and Literary Memorials of Presbyterianism in Ireland