This is a thought-provoking lesson.
My understanding of ''...we must choose to serve Truth or illusions. There are no alternatives." is this:
If we choose to serve illusions, then we are all stuck in a mindset that perpetuates fear. Fear of the unknown or what we don't understand. In turn, that turns us into something that we try hard not to become. Tyrannical, at best. If we remember some history, it's that kind of 'wrong-mindedness' that was a sort of precursor to The Crusades. A bit on the extreme side, yes, but it serves to remind us of how blessed we are to have a choice. Illusions are the projections of vulnerable individuals that seek to control what they cannot handle within themselves. When we choose to serve Truth, our 'right-mindedness' can bring us to and closer to God. It leaves no room for hate or despair, or a weight on our hearts. We cannot have it both ways for our Minds to grasp 'Right-Mindedness'. The Truth shall set you free.
Our perceptions can have a lot of impact on how we see the world and feel within ourselves. How we perceive ourselves and the world would depend on letting go of our fears and misgivings. We project what we fear and in turn changes our perception on how we use prayer or our faith all together. If we can learn to let go of our fears, we can project a more balanced and steady flow of His Spirit. Our perceptions of how we see or feel The Divine would be vastly different. Connection and communications are key. We have to let go of the illusions we are used to in order to grasp and appreciate the full power of Prayer. The way it is intended for us.
Be Blessed.