If all "things" (including concepts) are "empty" - i.e., not existing unto themselves alone but dependent on other "things" and concepts that are equally dependent on them to BE, THEN...
knowing nothing (the nature of emptiness) is indeed to know everything, i.e., the underlying nature of everything
I think Buddhism hits on a certain amount of truth.
I think the book of
Ecclesiastes which was the writing of the man who had the reputation of being one of the wisest in history
Solomon - does intersect with some Buddhist concepts.
"Vanity of vanities - all is vanity" and how Solomon develops those concepts under the inspiration of God, remind me much Buddhist thought about the illusion of human life in a number of aspects.
Things are not as they appear to be. There is a missing substance behind the façade of existence. This kind of concept I think is taught in Buddhism and is echoed to a strong degree in that part of the Bible -
Ecclesiastes..
This book could be regarded as giving equal time in the bible for the wise utterance of the emptiness, the futility, the façade of life without some core reality.
I think Solomon also speaks of the core reality in the next book -
The Song of Songs in highly poetic romantic language meant to convey the love affair of Christ and His corporate Bride with which the Bible closes.
But the vanity of Solomon's pessimisim and the emptiness of Buddhism I think are similar.