Should I not intentionally utilize the LOA? By doing so, am I serving my mind and not my true purpose? I am not an unintelligent person.
I agree you are not unintelligent; this is something that trips up most aspirants. It sounds like you are combining two approaches to living. It may be difficult to reconcile LOA with Tolle's approach. Dropping the word should from your thinking would help you though, we are all free to live in a way that suits us best. Eckhart is giving pointers to awaken to our true nature, rather than a mandate for living. Many people find they are not ready to fully commit to awakening, there is no sense of shame or failure in that. One can only do what they are ready willing and able to do.
Someone I know quite well, is very much involved in something called: The Intenders of the Highest Good http://intenders.com/
She has read PON and ANE, and enjoyed them, but could not apply it well to her life due to the differences in approaches, and lack of readiness to do so. She enjoys manifesting or attracting, and is actually doing fairly well at it; her life is looking good on the surface by human standards, and she is relatively happy, some of the "intending" has a selfless compassionate flavor to it, and I believe she means well. But I also noticed the drama and attachment in her life, that comes with the territory of desiring things and conditions. She often lives mentally in the future and past. Recalling what did not work out and hoping for what will be good going forward. She tends to get angry when things don't go as "intended". She has trouble being still and quiet, and is often on the go with her busy lifestyle of creating, the striving often results in conflict and accumulation of stress.
So the rhetorical question: Is she manifesting from her source and true nature, or is it mind and personal sense? I would say there is a dualistic quality to her approach to life. It is coming from a sense of separation from source, and wanting to control conditions which is what we all do when we feel separate and cut off from life. This is egoic sense. Although striving to be selfless and compassionate is better than the opposite of this. An unawake human will never succeed in being selfless, at least not for long; and their actions and outcomes will have a dualistic quality, the good they attempt will have unintended side effects. Which is why all human attempts to solve world problems have failed. True selflessness is a natural outcome of awakening.
One more thing, Tolle speaks about this at a retreat. He says if many humans operating from egoic sense, learn how to use the mind to attract or manifest what they desire, it would have devastating consequences to the planet. At the end of ANE, Eckhart reveals that awakening goes beyond just meeting our own needs and wanting to be individually free. There is larger context of global awakening of the collective consciousness that is occurring. Our higher purpose is really to awaken to our oneness with the totality.
So I would say, do what you are comfortable and drawn to do. You may be able to combine some elements of both, LOA and true awakening, I don't know. My suggestion is to simply follow your instincts and intuition, rather than adhering to someone else's blueprint exactly. You can be awake and set goals that arise from Presence, and carry them out in "clock time"; but it always takes place in the Now, the planning and the fulfillment of it is always now. This is different than desire and attracting. It is more like opening to the expression of what already is.
Make a point to be completely honest and true to yourself, find your authentic self and let that guide you, that is the best anyone can do.