18th century phrase, the "Great End"

In the grant for the Philips Academy there is language which I find difficult to ascertain the real meaning.

From the bottom of page 463 here

...to lay the foundation of a free public School or Academy for the purpose of instructing Youth, not only in English and Latin Grammar, Writing, Arithmetic, and those Sciences, wherein they are commonly taught; but more especially to learn them the Great End and Real Business of Living

My question is, what does the GREAT END mean in this document. Is this a common 18th century phrase?

I feel the emphasized portion is ambiguous and informal, however the author clearly felt otherwise.

Solution 1:

end

4

a : an outcome worked toward : purpose (the end of poetry is to be poetry — R. P. Warren)

Merriam Webster

Given that the school was founded in the late 1700s in America, it is almost certain that the 'great purpose' of life that is meant here is the Christian one of serving God.

EDIT

Here's another work from the 1700s that supports this conclusion:

Which therefore is, or ought to be the great End of your eating and drinking, and of all and every Action of your whole Life. As we learn from his Apostle, faying, Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God

The great necessity ... of publick prayer and frequent Communion By William Beveridge 1709