the nine distractions for the mind (Patanjali)

Obstacles are to be expected: There are a number of predictable obstacles (1.30) that arise on the inner journey, along with several consequences (1.31) that grow out of them. While these can be a challenge, there is a certain comfort in knowing that they are a natural, predictable part of the process. Knowing this can help to maintain the faith and conviction that were previously discussed as essential (1.20).

Predictable Obstacles (1.30)
Illness	Dullness		Doubt
Negligence	Laziness		Cravings
Misperceptions	Failure		Instability
Companions to those Obstacles (1.31)
Mental and physical pain		Sadness and frustration
Unsteadiness of the body		Irregular breath

One-pointedness is the solution: There is a single, underlying principle that is the antidote for these obstacles and their consequences, and that is the one-pointedness of mind (1.32). Although there are many forms in which this one-pointedness can be practiced, the principle is uniform. If the mind is focused, then it is far less likely to get entangled and lost in the mire of delusion that can come from these obstacles (1.4).
Remember one truth or object: Repeatedly remember one aspect of truth, or one object (1.32). It may be any object, including one of the several that are suggested in the coming sutras (1.33-1.39). It may be related to your religion, an aspect of your own being, a principle, or some other pleasing object. It may be a mantra, short prayer, or affirmation. While there is great breadth of choice in objects, a sincere aspirant will choose wisely the object for this practice, possibly along with the guidance of someone familiar with these practices.