My metaphysical studies began, back in the early 1990s, with the Seth material and the books of Jane Roberts. Seth is a non-physical entity from another plane of reality, and his teachings were channeled through a writer named Jane Roberts, who also shared her own thoughts and ideas through her works of fiction and non-fiction. Whether or not you "believe" that Seth is "real," the ideas he and Jane shared are, in my experience, creative, wise and very useful in building the life you wish to live.
While Seth never used the word "unschooling," I recently found the following quotes, which to me describe the essence of learning that is self-directed and individually authentic:
"Each person can also intrinsically sense the direction in which he or she is most inclined. Inspiration will send nudges towards certain activities. It will be easier and more delightful for each person to move and grow in certain directions rather than others."
"By looking at your own life, you can quite easily discover in what areas your own abilities lie by following the shape of your own impulses and inclinations. You cannot learn about yourself by studying what is expected of you by others – but only by asking yourself what you expect of yourself, and discovering for yourself in what direction your abilities lie."
Seth through Jane Roberts. The Way Toward Health. Amber-Allen, 1997. Pages 175-176.
"I have mentioned before that play is essential for growth and development. Children learn through play-acting. They imagine themselves to be in all kinds of situations. They see themselves in dangerous predicaments, and then conjure up their own methods of escape. They try out the roles of other family members, imagine themselves rich and poor, old and young, male and female. This allows children a sense of freedom, independence, and power as they see themselves acting forcibly in all kinds of situations. To a child, play and work are often one and the same thing."
Seth through Jane Roberts. The Way Toward Health. Amber-Allen, 1997. Pages 222-223.