St. Thomas proposes four rules: (1) To set in order what one wants to rememberbach; (2) to apply the mind deeply to it; (3) to think over it often; (4) when one wants to recollect it, to take the chain of connections by one end, which will bring the rest with it.
–AG Sertillanges, O.P., The Intellectual Life: Its Spirit, Conditions, Methods, trans. Mary Ryan, 181-182