The effect of your thoughts

I have said to you many times that the world you see is nothing more than the effect of the  thoughts  you  have  held  within  the  mind.
Therefore,  awakening  requires  the  act  of vigilance and discipline.
The discipline to cultivate a way of living in which you observe your own thoughts, in which you listen to the words that are coming out of your mouth, in which  you  observe  the  feelings that  are evoked  within  your  body,  the  reactivity  that seems to own you, and to see these things as innocent and simply self-caused.

From The Way of Mastery, Book 1:
The Way of the Heart
Jeshua ben Joseph
(Jesus)