The primary great and simple insight of William Arkle, in which respect he excels - beyond any other source I have discovered (ancient or modern) - is the clarity with which he understand the primary purpose for which God created Man and the rest of reality.
http://williamarkle.blogspot.co.uk/
His point is that God created, in order to have divine friends.
God is - indeed - Heavenly Father and Mother; and men and women were created so that eventually and ultimately they may (via experience, striving and learning) choose to become beings of the same nature; therefore not only children of God, but grown-up children of God. Grown-up to full divinity.
If this is accepted and embraced as truth (which can only be a consequence of personal revelation; not of evidence, reason or any other 'proof' - but as a simple consequence of the traditional Christian understanding of God as creator and loving parent) this single insight changes 'everything'.
Well, not everything - the basics of Christianity remain identical; but what those basics are is clarified, and what they mean and how they interact are transformed; furthermore it can be seen that a great deal of assertion and interpretation of the past is mistaken (often understandably and justifiably so - but mistaken nonetheless).
With this single primary insight, we have a way of judging and evaluating the mass of apparently contradictory assertions accumulated by history, and by our own inferences.
It is a key that makes possible much else. From where we are here-and-now (a world full of dominant and deliberate disinformation; in which original naïve innocence is so generally corrupted, subverted, inverted) - that key seems ever-more essential.