Because thesis statements contain a lot of information, you should revise it to avoid awkward wording. Since your agreement sentence comes directly before, you can start the thesis statement with, "The truth of this statement is shown by" then list the literary works and elements. The phrase "The truth of" serves as a transition between the agreement sentence and your thesis, but it leads you to write in the passive. An active statement is more decisive: "The conflict in the novel 'The Old Man in the Sea' shows the truth of the quotation." The certainty of this statement sets the stage for supporting your position.