An American born Buddhist monk, Thanisaro Bhikku, published a book called "Wings To Awakening". You can find a free copy by Googling. The theme of the book is that the Buddha knew that his teachings would eventually get distorted and die out. The Buddha made several lists describing qualities a person could develop. The most famous of these lists is The 8 Fold Path. His theory was that if a person worked to develop all of the qualities on any of those lists the quest would eventually force them to rediscover and relearn his teachings.
In the preface to this book he calls the wings to awakening "bodhi-pakkhiya-dhamma." Wikipedia has an entry about this. Is it accurate? The book is also mostly sutras. Is this a good place to start studying sutras?