Sometimes it’s the intellect which blinds us, to those things which can only be apprehended with the spirit and experienced in the heart.
If you mean than the intellect can hamper or prevent one from immersing in self-deception, then yes, I agree with you. If you want to argue that for some people, or for certain circumstances, self-deception may be necessary, I suppose one could make a case for that. I, personally, make an effort to eschew self-deception. How successful I am at that goal may be debatable, but that is my goal regardless.
I will assume that spirit and heart are used metaphorically, in which case I reject the notion that one cannot intellectually understand their emotions and experience them as emotions at the same time. In other words, one can intellectually understand what love is in all the many ways we use that word and still experience (and value) love in all those many uses (and for that matter, fully recognize the potential negative aspects to love in all its varied forms). Intellect, knowledge, understanding, does not make, or turn one into, an unemotional robot.
If spirit is meant in some literal fashion, then I would only say that it is a concept with which I do not agree exists.