"Dreams, music, moments of heroism and self-sacrifice, the sadness of great joy, pride in past suffering, etc., reveal that the original nature of the Will is not pleasure, but sublimity."
"Sketch Notes for a New System of Philosophy" was Lindsay's title for a collection of notes, aphorisms and ideas gleaned from his notebooks. Each short entry is numbered, and, in total, the selection comes to over 530 items. The full manuscript is held in the National Library of Scotland, Edinburgh, but a selection has been printed several times in the years after Lindsay's death (see Publication, below).
The notes are too short and eccentric to form a genuine "System", but, instead, are closer in spirit to records of breakthrough moments in his own thinking (or "aperçues" as Lindsay called them). As so often when the "I must write that down" impulse hits, the results don't always communicate the thought that led to the impulse, but some of the notes can help to understand Lindsay as a man and writer.
Abraxas magazine has the published notes online. See their article index.
David Lindsay's surviving letters to E H Visiak were published in Adam International Review in 1971.
Sketch Notes for a New System of Philosophy
Letters