Why: whoever, at the time of death, leaves the body remembering Krishna alone, attains his state, without doubt, restating directly the principle that final thought shapes what follows.

In life: under acute stress or crisis, people tend to default to whatever they've most deeply practiced, not to some fresh, improvised response.

Teaching: notice what your mind actually defaults to under sudden stress, that's a fair indicator of what you've been practicing, intentionally or not, and adjust your regular habits of attention accordingly.