Aizan, who regarded history as practical learning, had a belief that said 'just like the ancient times are still the same as the present ones, and the present times are similar to the ancient ones; life is controlled by the same principles and the country will rise and fall by circulating the same fate.'
実学として歴史を考えた愛山には、「古は猶今の如く、今は猶古の如く、人生は同じ法則に因りて動き、國は同じ運命を循環して盛衰する」という信念があった。