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Read & copy
“A teacher affects eternity; he can never tell where his influence stops.”
Meaning & context
Adams emphasizes that teaching can shape later judgments and lives in ways the teacher cannot fully trace or control once students carry ideas beyond the classroom.
Source details
The Education of Henry Adams, chapter on teaching at Harvard, Project Gutenberg #2044. Adams follows the sentence by stressing the moral and philosophical difficulty of teaching history; it is a reflective claim about educational influence, not a measurable promise of permanent impact.