In Amitabha's original wish, that is, 18 wish, it is said that "I believe in happiness and want to be born in China, and I want to study for ten years". The original meaning of "reading" is to meditate in your heart, but you can also read with your mouth, because when you read with your mouth, your heart is also reading. Therefore, meditation is the correct way to pronounce. On the contrary, it is easy to concentrate when chanting Buddha with your heart, and it is easy to get distracted when chanting Buddha with your mouth, so meditation with your heart is advocated.
In fact, it is very simple and easy for pure land Sect to recite Buddha. It doesn't need us to remember that our mind is undisturbed or distracted. A clean heart can recite Buddha, but a troubled heart can recite Buddha. After death, I will naturally read Buddha with a pure heart under the blessing of Buddha. As long as you don't have too much confusion when studying Buddhism in the world of Nuwa, just like "Ode to Pure Land Buddhist Sutra" says "thoughts are not chaotic".
May you achieve something.