Yogācārabhūmi-śāstra, Volume XXXIV, Part 3

Observing the truth of suffering through ten aspects enables one to progressively comprehend the four aspects of the truth of suffering. What are these ten? They are: 1) the aspect of alteration, 2) the aspect of destruction, 3) the aspect of separation, 4) the aspect of dharma-nature, 5) the aspect of aggregation, 6) the aspect of bondage, 7) the aspect of undesirability, 8) the aspect of insecurity, 9) the aspect of non-acquisition, and 10) the aspect of non-autonomy. These ten aspects, based on the principle of realization, can be correctly observed.

Explanation: By observing the truth of suffering from these ten aspects, one can progressively comprehend the four aspects of the truth of suffering. What are these ten aspects? They are: first, the aspect of alteration; second, the aspect of destruction; third, the aspect of separation; fourth, the aspect of dharma-nature; fifth, the aspect of aggregation; sixth, the aspect of bondage; seventh, the aspect of undesirability; eighth, the aspect of insecurity; ninth, the aspect of non-acquisition; and tenth, the aspect of non-autonomy. These ten aspects, relying on the principle of realization, can be correctly observed.

This passage introduces the ten aspects. It is by observing the truth of suffering through these ten aspects that one comprehends the four aspects of the truth of suffering, and ultimately realizes the truth of suffering through the four aspects.