Wisdom of today - Meditating on the AUM.

Source : https://vivekavani.com/swami-vivekananda-quotes-om/

From the Yoga Sutra's of Patanjali we learn :

1.27. God's voice is Om.

1.28. The repetition of Om should be made with an understanding of its meaning.

1.29. From that is gained introspection and also the disappearance of obstacles.

https://sacred-texts.com/hin/yogasutr.htm

Prabhupāda: Om vibration is there. Om is also representation of Kṛṣṇa. That is also accepted. But that is not ultimate. Ultimate is Kṛṣṇa. Just like there is some vibration, some source. You go, go, proceed, wherefrom this vibration is coming? If you find whether here is a horn. From this..., or conchshell. Here is vibration. So that, unless you reach that point... That is the ultimate. Not that vibration. Suppose I am vibrating conchshell. There is a huge sound. But is that vibration ultimate? Or the conchshell wherefrom the vibration is emanating, the conchshell is ultimate. The conchshell sound is going beyond this temple. Does it mean that conchshell sound is bigger than the conchshell? The vibration of the conchshell, apparently it seems to be very great, but does it mean it is great? The great is the conchshell wherefrom the vibration is coming. That is the ultimate source. So oṁkāra vibration is all over the universe, that's all right; but wherefrom it is coming? That you have to search out. When you search out you'll find Kṛṣṇa. Therefore Kṛṣṇa is the ultimate. Not the vibration. Is that clear? Yes. The same example. The sunshine, all over the universe it is spread. Does it make it is greater than the sun? The sun is the source of the sunshine. So similarly, brahmaṇo hi pratiṣṭhāham, "I am the source of Brahman, the effulgence." That's a fact. Brahman is not greater than Kṛṣṇa. Kṛṣṇa is greater than Brahman. Mattaḥ parataro nāsti. You will find in the Bhagavad-gītā, "There is no more greater truth than Me." These people, they cannot understand; less intelligent. The same example. Because they see that the sunshine is spreading all over the universe, therefore it is more important, greater than the sun planet. But actually it is not. The simple truth. And if you go into the sun planet you will find Vivasvān the sun-god is there. The sun planet is so dazzling due to his presence. Similarly, with all impersonal conception, when you reach Kṛṣṇa, then you reach to the goal. There are so many crude examples. Just like your country. There are so many departmental government businesses going on. This department, that department, all over the country. The whole thing is concentrate in the President. How can I deny it? The everything is going on on the finger's end of the President. This is a crude example. Similarly, ultimately, unless there is the Supreme Person on the background... That, Hayagrīva has brought one book, Evidence of God. So the many scientists they have written in that book, and they have agreed that if God is there, He must be person. He must be person. Is not that, Hayagrīva?

https://vedabase.io/en/library/transcripts/681216bgla/

Yoga Sutras 1.23-1.29: 
Contemplation on AUM (or OM)

OM is a direct path: Remembering the sound vibration of AUM (or OM), along with a deep feeling for the meaning of what it represents (1.28), brings both the realization of the individual Self and the removal of obstacles that normally block that realization (1.29). In a sense, this practice is like a short cut, in that it goes directly to the heart of the process.

Systematically piercing the levels: This practice takes one on a direct route inward, systematically piercing the levels of consciousness. It is done with sincerity and dedication (1.23) towards the untainted creative source or pure consciousness (1.24), which AUM represents (1.27). That consciousness contains the seed of omniscience (1.25), which is the source of the teachings of all the ancient sages (1.26).

Remember the meaning: For it to have its effect, the sound of AUM is remembered with deep feeling for the meaning of what it represents. (1.28)

https://www.swamij.com/yoga-sutras-12329.htm