It is God Himself...

‘It is God Himself who in holy wrath needs to be propitiated, God Himself who in holy love undertook to do the propitiating, and God Himself who, in the person of His Son, died for the propitiation of our sins. Thus God took His own loving initiative to appease His own righteous anger by bearing it His own self in His own Son when He took our place and died for us. There is no crudity here to evoke our ridicule, only profundity of holy love to evoke our worship.’ - John Stott, The Cross of Christ