"Christ had all sin laid upon Him, but no sin lived in Him. 'He was numbered among transgressors,' (Isa. 53:12). He who was numbered with the persons of the Trinity, He is said 'to bear the sins of many,' (Heb. 9:28).
Now, this was the lowest degree of Christ’s humiliation. For Christ to be reputed as a sinner, never such a pattern of humility! That Christ, who would not endure sin in the angels, should Himself endure to have sin imputed to Him, it is the most amazing humility that ever was!"
--Thomas Watson, A Body of Divinity Contained in Sermons Upon the Westminster Assembly's Catechism (Edinburgh: Banner of Truth Trust, 1692/1970), 197.