Each night for over a year I have recited the mantra. Only once did I attempt and succeed at repeating it 108 times, which is an important if not magical number in Buddhism. I'll not go into detail here but if you are interested be sure to google it! The Buddhist mala is a 108 beaded necklace that is used to help keep count with the chanting of the matra.
This poster is the premise of the Sutra but it becomes very clear with Thich Nhat Hanh's explanation of the Heart Sutra reproduced below. Hanh is a well known and respected Vietnamese Buddhist monk and peace activist. To learn more about Hanh, click here: https://plumvillage.org/about/thich-nhat-hanh/
This is a more formal translation by Thich Nhat Hanh.