I must report that I have come to know (not just think/believe/speculate) that there is only one Truth, and you either know Him, or you don't. This inexorable conclusion is the result of my entire lifetime's deep philosophical thought, indeed with the primary intention of seeking the ultimate truth. Alas, truth CAN be known, and be shared - all you have to do is turn to the one that has/is it.
Otherwise, you can speculate and spin your wheels until you're blue in the face. For the pure gain that comes from that experience (thinking it all out carefully - exploring), that can be a healthy exercise. But if you really seek and desire the Truth strongly enough, in the end you see there is only one source, and you will accept Him. That is the only way you can be connected to Truth, and you must be content to be shown more gradually over time, when you are ready. It takes time, patience, and faith. Faith - in that you are being led by one that is looking out for your best interest. It is here that most fail, because they are deceived into thinking something else is the case.
Thus it's all about humility - something which flies in the face of a great calculating and deep thinking mind. A humble position... but if that is indeed the reality, once you realize it, if you refuse to accept it - you are no longer a philosopher, but a fool.