" There are four things whereby a man perfects his memory.
• First, when a man wishes to remember a thing, he should take some suitable yet unwonted illustration of it, since the unwonted strikes us more, and so makes a greater and stronger impression on the mind.
• Secondly, whatever a man wishes to retain in his memory he must carefully consider to put in order, so that he may pass easily from one memory to another.
• Thirdly, we must be anxious and earnest about the things we wish to remember, because the more a thing is impressed on the mind, the less it is liable to slip out of it.
• Fourthly, we should often reflect on the things we wish to remember ... wherefore when we reflect on a thing frequently, we quickly call it to mind, through passing from one thing to another by a kind of natural order. "

― Thomas Aquinas