...keep my words;...
write them on the tablet of your heart.
The word "tablet" has changed a bit, don't you think?
The writers of olden times painstakingly "hammered away" at transcribing the Words of God when all we have to do today is "cut and paste." The meaning is the same, though, and these words from Proverbs stand true today.
It is so important to have God's Word ready and easily available. But when you don't have the written Word in front of you, if it is written on your heart, you have instant access.