How to Prolong Life and See Self Nature via Chanting 如何念佛延壽并見性

(English subtitles)南懷瑾老師教如何念佛, Lectured by HuaiJin Nan, 1918 - 2012, a prominent Buddhist, religious scholar, and writer. A well-regarded spiritual teacher.
Subtitles:
Namo Amituofo( Amitabha Buddha). Chant calmly, follow your inhalation and exhalation. Chant in on breath. For example, chant out loud, Namo...
There are a few ways, and you have to realize slowly. I can't cover everything in a short time. Namo Amituofo. You didn't count how many sounds I chant in only one breath. No breath in between. After this breath is done, no matter what. You know you don't have air. Shut your mouth and no inhale. Your mind has no thought, and calm down. It will breathe naturally, which is Anapana. Breathe naturally until full of air. When full of air, random thoughts come. Then chant to stop thoughts.
We call this chant: Throw a meat bun to hit a dog. Dogs are our random thoughts. When the thoughts come, throw the meat bun, Amituofo. When the thoughts come, throw the meat bun, Amituofo. Bang, hit it, then the dog eats the meat bun. When the bun is eaten by the dog, the distract thoughts are gone. Calm down first. Look around, no one, ignore the neighbors.
2:00
Namo Amituofo. Nothing there, thoughts are empty naturally. You may chant out loud when alone. There is another way of vocal chant, Vajra chant. This is how Tantric Sect chant mantras. It seems that somebody writing me a note. Wants me to pass on several mantras. Alas, don't be greedy. Only a phrase of Buddha name, you can become a Buddha. What do you need mantras for? No need mantra. The so-called Vajra chant, notice. You practicing Tantra maybe... Did those master abhiseca(sprinkle) for you?
Vajra chanting is that lips don't move, and teeth don't move. Slightly open mouth, tongue is vibrating. Practicing this method well is really useful. More terrific than any qigong. That is real Anapana. The voice initiate from your lower part of abdomen and goes up to the top from center, then vibrates the central vein open. Remember vajra chant. Do not move lips or teeth, chant phrases in each breath.
So, if a few well practiced lamas, monks get together. We sit together and chant. People outside will come to a standstill on hearing it. He will be calmed by this voice. His random thoughts and vexation will be cleaned. His karmic hindrance could be eliminated.
4:00
Namo Amituofo. Lips are not moving. Teeth are not moving, only use tongue. Instead of listening to outside, both ears turn to hear your voice. Instead of looking outside, both eyes turn to focus on your heart. Body sits in still and meditate. Namo Amituofo. One breath. In this period, I took a fast breath because I was tired. Take a breath by stealth, this is a secret skill. In the period, I shut my mouth. Stop vajra chant, and inhale via nose. Namo Amituofo.
6:00
The more you chant, the longer is your breath, you longer is your lifespan. Infinite life light Buddha, it's not fake.
See that? Here, you two. Do you study Buddhism very well? Not good, then you have to practice hard. Even I practice, and you don't.
Like that, you shouldn't ignore it. Chant out loud, or chant subtly. Practice Guan Yin(Avalokitesvara) dharma door by your ears. Do not listen to the outside sound but turn to listen to the inner sound of chanting Buddha. The more you listen, the more you are calm, enter samadhi of chanting Buddha. Eyes do not look out anymore. Only you can hear the sound, and others cannot hear it. Chant subtly. It's still one breath.
7:30
This sound is so subtle that only you can hear it. Gradually, you hear the sound of heart. Finally, in accordance with Guan Yin dharma door.
This is Tantric Sect, you go to Tibet to study Tantra. I don't know how many are practicing it now. I have passed everything on to you, it's not a secret at all. Everything comes to me, I will not keep it secret. The Way, people often ask me, Teacher Nan. I said, I am not a teacher, I speak sincerely. The Way is a public way in the world, and it doesn't belong to me. I knew it before, so I pass it on to you. You shouldn't be selfish. It's not called the Way if I am selfish.