- Children are born persons.
- Mason's foundational assertion is that a child is not a blank slate waiting to be inscribed, nor a vessel to be filled with pre-approved content. Learning is a relationship between a person and an idea. The teacher's job is to remove obstacles and arrange the meeting — not to pre-digest the idea and deliver it in digestible fragments. This single premise explains most of the method's other choices: if the child is a full person, the child deserves full texts, full ideas, and the full experience of thinking.
- Living books over textbooks.
- A living book is written by one author who knows and genuinely cares about the subject, and whose enthusiasm is audible on the page. It is distinguished from a textbook not by its age or literary reputation but by its voice: particular, curious, willing to be wrong, willing to follow an idea past the tidy summary. Mason's test: does this book contain a living idea the child can meet directly, or is it a compendium of facts arranged for examination? Narrative histories, naturalists' journals, biographies, and first-person scientific accounts are common examples. Multi-author textbooks designed for comprehensive coverage almost never qualify.
- Narration as the primary output mode.
- After a reading, the child closes the book and tells back what was read — in their own words, at their own pace. This is not summary. It is reconstruction. The child must hold the idea in mind, select what matters to them, find language for it, and arrange that language into something someone else can follow. That process is the learning. Written narration eventually replaces most formal composition instruction through the mid-elementary years, because the child has been practising the underlying skill — finding words for ideas — from the beginning.
- Short lessons, wide curriculum.
- Mason's timetables for early primary students show 15-minute lessons, rising to 30 to 45 minutes for older students. Six or eight subjects appear in a single school day, none crowding the others out. The width is deliberate: Mason believed a mind acquainted with many subjects is better furnished for later specialisation than one drilled deeply in a few. The short lesson length preserves attention by ending a lesson while the child is still engaged, not after attention has broken down.
- Nature study and the atmosphere of the home.
- Daily outdoor time — treated as study, not recreation — is a structural commitment in the Mason method. Children keep nature notebooks: dated observations, pencil sketches, questions worth returning to. Beyond formal nature study, Mason wrote extensively about the "education of the atmosphere" — what books are visible in a home, what conversations happen at meals, what work the adults around the child are seen to value — as curriculum operating continuously in the background. The child absorbs much of their education from this ambient environment, and parents who attend to it are teaching even when no lesson is running.
- Habit training.
- Mason argued that habits, once formed, run automatically and free cognitive load for new learning. Early years invest in attention habits, orderliness, truth-telling, and completion — not primarily as moral instruction but as practical infrastructure. A child who has built the habit of paying attention for fifteen minutes can learn; a child who has not will spend the lesson's energy managing distraction instead.