Your own intelligence is the only sensible way. Nobody else can enlighten you, in fact, nothing external will lead to enlightenment.



Let's look at this common saying: "I can only show you the door, but you have to walk through it yourself." The first part describes the extent of what can be done through external means while the second part asserts that you are on your own.



So, if you ever happen to find yourself turned towards the internal, an honest intellect will be helpful.



edit:

I guess I didn't try to explain why an honest intellect is useful. I consider enlightenment to mean truth-realization. The only place where falseness can reside is within the mind. So realizing the truth is the same as removing all false ideas. Empty the cup.



In that regard it should be clear that an honest intellect, not in terms of IQ or problem solving, but rather of reasoning, clear seeing and deduction, is indeed very helpful. The emphasis is more on honesty than intelligence in some sense.



Vince implies that you don't need reasoning and deduction. That's true in the context of looking at enlightenment simply to be more spiritual or similar. In the context of actually walking the path of enlightenment, you'll have to work it out on your own and your intellect is the only thing that will ever work something out. It is extremely improbable that you'll stumble upon truth-realization just by philosophizing about spiritual matters without any clear intent and focus.



In the words of Lao Tzu: "Spiritual freedom and oneness with the Tao are not randomly bestowed gifts, but the rewards of conscious self-transformation and self-evolution."