[Continuation of why a person should learn some Torah by heart]
2. [Learning some Torah by heart] facilitates performing the mitzva of ‘you shall speak in them at home and when on the way’. Going to the beis midrash is not always practical, and sometimes a person is in a place where there is no light or he didn’t bring a sefer with him, but if he knows some mishnayos by heart he can utilize such times to earn tremendous reward. Also when travelling learning from a sefer is not always practical, but if he knows something by heart he can repeat it to himself again and again.