What is the limitation of authority imposed by the client on the solicitor?

In Scherer v. Paletta, supra, Evans J.A. reasoned that a court should not embark upon any inquiry as to the limitation of authority imposed by the client upon the solicitor where: 1) the parties are of full age and capacity; 2) there is no dispute as to the fact that a retainer exists; and 3) there is no dispute as to the terms agreed upon between the solicitors