There has to be something more than that which is already known and experienced by the world around us. What is that something? How does one explore it? Where does one find it?
That is not to say that books and great thinkers of the past aren't relevant and beneficial for us to open our minds to and explore when we have questions and have yet to discover the Source of all Knowledge. A good example of this is an excerpt out of the Enlightenment book below, where MSI describes the benefit of first hand experience with the Source of all Knowledge.
MSI was a powerful writer, always encouraging the readers of his books to seek beyond the known or someone else's (even his own) thoughts/experiences to taste first hand the Source of Truth.
Pada I Sutra 25
The Ascendant, the Source of all knowledge, cannot be surpassed
It is not possible to go beyond the Infinite Ascendant. If it were, it would not be infinite. The Ascendant is the Source of everything, all knowledge, all thought, all that exists. This is how it is possible to rewrite the internal programs that limit individual consciousness. By experiencing the Absolute, all the previous impressions are purified. Since this is so, it becomes absurdly easy to transform life -- no problem, regardless how tenacious, can lie beyond the flawless subtlety of the Ascendant, and therefore no problem can be beyond the power of the Absolute to solve. Regardless how deeply we dig ourselves into difficulty and trouble, still beyond this is the Supreme, awaiting only our attention to heal us. Thus is the path to freedom from our problems utterly simple, whatever the problems may be -- take the awareness to the Ascendant, and there you are. All done for you, automatically.