I am in politics because of the conflict between good and evil, and I believe that in the end good will triumph.

The line frames politics not as technocratic management but as a moral arena in which fundamental values are at stake. By casting political life as a “conflict between good and evil,” the speaker claims an ethical mandate for action and invites listeners to judge policies in terms of right and wrong rather than mere interest or expediency. The closing assurance—“in the end good will triumph”—adds a providential or teleological note: perseverance is justified because history (or moral order) bends toward justice. In Thatcher’s idiom, this kind of moral clarity often functioned rhetorically to stiffen resolve, legitimize confrontation with perceived adversaries, and present political choices as tests of character.