(quote Steve Pavlina)
Now we've supposedly left the territory of the intellect and entered the spiritual realm. We try to interact intelligently with our outer world and spiritually with our inner world.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/spiritual-articles/22262-spirituality-v-s-intelligence.html

Here Steve Pavlina is simply confusing the term intellect, ponder over his own example. Spirituality needs intellect, the basic reason they seem to differ is because a part of intellect follows other realms of life like reasons or science and that part keeps struggling to understand the unknown realm. When that part is subdues either with close experience of the enlightened one or due to growing up towards spiritual realms,same intellect becomes useful in this regard.. Without intellect, there is no chance of spiritual ecstasy either. Interestingly in spirituality, "Gyaan" knowledge is vtal for its experience.