A Course in Miracles Topic - Vigilance

It is only because you have exerted so much effort in trying to make illusions true, that effort and vigilance are necessary to free yourself. 

It is only your awareness that needs protection, since being cannot be assailed. Yet a real sense of being cannot be yours while you are doubtful of what you are. This is why vigilance is essential. Doubts about being must not enter your mind, or you cannot know what you are with certainty. Certainty is of God for you. Vigilance is not necessary for truth, but it is necessary against illusions.            T-6.V.C.8:4-9.

Belief does not require vigilance unless it is conflicted. If it is, there are conflicting components within it that have led to a state of war, and vigilance has therefore become essential. Vigilance has no place in peace. It is necessary against beliefs that are not true, …                                         T-7.VI.7:3-6.

When you strive for anything in this world in the belief that it will bring you peace, you are belittling yourself and blinding yourself to glory. Littleness and glory are the choices open to your striving and your vigilance. You will always choose one at the expense of the other.                 T-15.III.1:6-8. 

Now you are merely asked that you pursue another goal with far less vigilance; with little effort and with little time, and with the power of God maintaining it, and promising success.    T-24.VI.12:1.