Ananda was famous for his memory, but we shouldn’t misunderstand and think that advice to memorize and constantly reflect on the dhamma we memorized only applied to Ananda, or people with extraordinary memory, or reciter monks tasked with memorizing portions of the tipitaka. The same instructions come across regularly in the suttas, applicable to everyone, not just Ananda.
In AN 6.29 for example, the buddha asks a monk, ‘what are the 6 recollections’? The monk gives the wrong answer, and the Buddha calls that monk “a fool”.
After reading that sutta a few times, I realized even though I’m not a monk, the Buddha was talking to everyone who wants nirvana. I’m no fool, so I memorized (sati) it, and recite it daily, reflect on it (using V&V vitakka and vicara of first jhana) as I recite it, and reflect on it any time it’s relevant throughout the day.
I can’t emphasize enough how important this practice is. The only difference between Ananda and you is the amount you memorize, but the practice of relating to what you do have memorized is the same, it involves memory (sati), being rememberful and a rememberer (sato), this practice is samadhi, and you should be doing it all the time if you care about nirvana.
One of the first things I started doing after this insight really sunk in, is I stopped reciting useless things that I memorized, let those fade from memory, identified what were the critical necessities that I didn’t yet have memorized that were important to nirvana, and acted accordingly. IMO, most pali chanting books I’ve seen contain over 50% unnecessary things I wouldn’t bother memorizing. And most of the most important things you should have memorized aren’t in most chanting books.
If every Buddhist did this, memorizing the important core, word for word, the Dhamma wouldn’t get corrupted. Or at least, if there was unintentional corruption from misinterpretation or misunderstanding of the Buddha’s words, then later generations at least have an opportunity to recover the lost meaning and figure out the misinterpretation.