What did Locke mean by thus children may be cozen'd into a knowledge of letters?

In this context, john Locke is suggesting that children can be deceived or misled into learning letters and the alphabet without fully understanding their meanings or significance. He implies that rote memorization can occur without genuine comprehension, indicating that children might learn to recognize letters as symbols without grasping the broader concepts of language or literacy. Locke emphasizes the importance of meaningful learning over mere memorization in the educational process.