Herein vs. Therein

Herein and Therein Definitions
Herein
In or into this.
Therein
In that place, time, or thing.
Herein
In this; within this content, context, or thing.
Therein
In that circumstance or respect.
Herein
In this.
Herein is my Father glorified, that ye bear much fruit.
Therein
(pronominal) in that; in that place; in him/her/it.
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Herein
In this place or thing or document;
I shall discuss the question herein
Therein
In that or this place, time, or thing; in that particular or respect.
He pricketh through a fair forest,Therein is many a wild beast.
Bring forth abundantly in the earth, and multiply therein.
Therein our letters do not well agree.
Therein
(formal) in or into that thing or place;
They can read therein what our plans are