Know Lots Before Teaching

Nor he who loves abundance with increase.

is also interpreted as referring to Torah:
For whom is it fitting to teach an abundance of people?
One for whom all its increase belongs to him,
i.e., one who knows all the content of the
Torah is worthy of teaching it in public.

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Who can express the mighty acts of God, or make all His praise heard?

For whom is it fitting to express the mighty acts of God?
It is one who can make all His praise heard.
One who knows only part of it is unfit to teach the multitudes.