As to the amount of knowledge that you receive, that is dependent wholly and solely upon your capacity for appreciating it. There is an infinity of wisdom, range upon range upon range, but it can only become available to you as you are mentally and spiritually equipped to receive it. But no knowledge alters truth. There is no wisdom that in any way alters the truth of any teaching. If it was true in the past is is true today and will be true tomorrow.
Truth is constant and eternal.
You can add to wisdom, you can add to knowledge, but you cannot bring new truth. Your world has all the truth that it requires for its essential purpose - the fundamental truths of kindness, service, love. It knows what it should do in order to have a better world. All that is neccesry for your growth, progress, unfoldment, evolution has been made known throughout all the generations. If man would but follow the truth which has been revealed he could achieve here and now on earth far more of the divinity within him than has ever been manifested.