Very proud of his Scottish heritage, he was forever a Scot: ""Nemo me impune lacessit"" (no one attacks me with impunity). The Upper Canada rebellion leader W.L. Mackenzie referred to him, "He is every whit a self-made, self-educated man. Has large mental capacity and indomitable energy." Canada's Governor General, Lord Dufferin, said of him, he is "as pure as crystal, and as true as steel, with lots of common sense." A close friend, Chief Justice Sir Louis Davies, said he was "the best debater the House of Commons has ever known." A friend and colleague in Cabinet who went on to become prime minister of Canada, Sir Wilfrid Laurier, said he was "one of the truest and strongest characters to be met within Canadian history. He was endowed with a warm heart and a copious and rich fancy, though veiled by a somewhat reticent exterior, and he was of friends the most tender and true." Another friend and colleague, who went on to become premier of Ontario, Sir George Ross, said, "Mackenzie was "sui generis" a debater. His humorous sallies blistered like a blast from a flaming smelter. His sterling honesty is a great heritage, and will keep his memory green to all future generations." At his eulogy, Rev. Dr. Thomas compared him to the Duke of Wellington, who "stood four square, to all the winds that blow."