Understanding, we all know about, even if we fall short on it sometimes. A great review of its many colours can be found in the Cambridge Dictionary.
What about Overstanding? There is indeed such a word, as defined online:
overstand. Verb. (third-person singular simple present overstands, present participle overstanding, simple past and past participle overstood (rare) to stand or insist too much or too long; overstay. to stand too strictly on the demands or conditions of.
There's another definition in the Urban Dictionary, varying somewhat from the above, and I quote: "The Distinction between Overstanding and Understanding is a matter of context and awareness. To overstand is to comprehend a thing itself AND to have knowledge of why it is the way it is and of its place or role in the grand scheme of things."
This particular definition (in full) is a little challenged in grammatical English but makes a good read, so if you want the whole thing, diamonds and all, click here.
Given the above, we have three points of consideration. Understanding, to trawl the depths of a person, problem, or situation and subsequently gain knowledge as to the underlying components of the aforesaid, as opposed to Overstanding when we outstay a welcome on our verbosity, presence or limitations. Or conversely, to perhaps overthink it all somewhat.
On being presented with the question, my thoughts turned instantly to wave forms, the peaks and troughs and wells between. Bearing in mind that reality is a continuously shifting sandscape, and that each moment offers a different context to the last, we are nevertheless given to understand - to reach the depths of the matter and form a view from there. To overstand - to see it from above, and be either pious or over-reaching in resultant appraisal. To innerstand - well, the definition given in the link above is very comprehensive. Innerstanding is where the whole picture creates the vista, and it would be a sorry oversight not to quote from the definition given; "absolute, heart-centred knowledge from the core inner being (Source). This word truly requires no description, as it is the zero point to knowledge and being. The knowing that all is perfect and happens for a reason (cause & effect) to move one towards learning and expansion."
On questing for self-discovery, Innerstanding would surely stand us in good stead, were we to have more of it, methinks, and to reach that point wherein the definition lies would be to appreciate the scale of our part in the play, to see beyond ourselves to where all may be illuminated, if only for a moment. For it has to be said that if we understand, we are doing well, and if we overstand, we are dwelling too long, while our Innerstanding may be short-lived but valuable, a hefty contribution to our vision of What Is, and our collective creation of that which may, fate willing in a fair wind, come to pass.