That is to say - Tradução em português

Having stated his opinion – so far, that is to say, as acute nervous suffering will allow him to state anything – Mr. Fairlie has nothing to add but the expression of his decision, in reference to the highly irregular application that has been made to him. Perfect repose of body and mind being to the last degree important in his case, Mr.fairlie will not suffer Mr. Hartright to disturb that repose by remaining in the house under circumstances of an essentially irritating nature to both sides.

Por favor, traduzir os trechos destacados. Obrigado.