AUM / OM Chanting ...

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)

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.

1.30. Disease, inertia, doubt, lack of enthusiasm, laziness, sensuality, mind-wandering, missing the point, instability- these distractions of the mind are the obstacles.

1.31. Pain, despair, nervousness, and disordered inspiration and expiration are co-existent with these obstacles.

1.32. For the prevention of the obstacles, one truth should be practiced constantly.

1.33. By cultivating friendliness towards happiness and compassion towards misery, gladness towards virtue and indifference towards vice, the mind becomes pure.

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

See as well : https://vedabase.io/en/library/bg/7/8/