4.20

एकसमये चोभयानवधारणम्

eka-samaye cobhayānavadhāraṇam

The line

And both cannot be determined in a single moment.

नेपालीमा

अनि दुवैलाई एकै क्षणमा निश्चय गर्न सकिँदैन।

Where it sits

The first reply to 4.19, rejected. 4.21 rejects the second reply, that a second mind sees the first.

Split: eka (एक) + samaye (समये) + ca (च) + ubhaya (उभय) + anavadhāraṇam (अनवधारणम्)

Sanskrit, in depth

The words

WordGrammarSense
eka (एक)stemone.
samaye (समये)locative singularin one moment.
ca (च)indeclinableand. And furthermore.
ubhaya (उभय)stemboth.
anavadhāraṇam (अनवधारणम्)nominative singular, neuterthe not-determining. Both cannot be determined at once.

The phrases

And both cannot be determined in a single moment. ca (च) + ubhaya (उभय) is a (अ) + u (उ) = o (ओ), recited cobhaya (चोभय). ubhaya (उभय) + anavadhāraṇa (अनवधारण) is a (अ) + a (अ) = ā (आ). The two that cannot be grasped together are the mind's own form and the object. A single moment does not hold both determinations.

So the reply “it illuminates itself and the object together” fails on time. One moment, one determination.

Sanskrit in this line

a (अ) + u (उ) = o (ओ) in ca (च) + ubhaya (उभय) = cobhaya (चोभय). Locative samaye (समये), “in one moment.” The nominative anavadhāraṇam (अनवधारणम्) is a privative abstract used as the whole predicate: there is a not-determining of both.

Say it back

Say what cannot happen in one moment. Both.

Next

4.21. If a mind were seen by another mind, intellects would regress without end, and memories would be confused.