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A frequent change of role, and of the lighter sort - especially such as one does not like forcing one's self to use the very utmost of his ability in the performance of - is the training requisite for a mastery of the actor's art.

Edwin Booth, Edwina Booth Grossman (1894). “Edwin Booth: Recollections by His Daughter, Edwina Booth Grossmann, and Letters to Her and to His Friends”, New York : Century Company
A frequent change of role, and of the lighter sort - especially such as one does not like forcing one's self to use the very utmost of his ability in the performance of - is the training requisite for a mastery of the