Why: one who is disciplined in yoga sees the Self in all beings, and all beings in the Self, seeing the same in everything everywhere, again describing a leveled, unified way of seeing as a fruit of sustained practice.

In life: the more settled and practiced someone becomes, the more they tend to notice their common ground with people who initially seemed very different from them.

Teaching: as you build any sustained practice of your own, watch for whether your sense of connection to people unlike you is genuinely widening, that's a real, checkable sign of progress.