From the book Creative Mind and Success by Ernest S. Holmes:
One of the things which greatly hinders us from demonstrating a greater degree of prosperity we may call race thought or race consciousness. This is the result of all that the race has thought or believed. We are immersed in it, and those who are receptive to it are controlled by it. All thought seeks expression along the lines of least resistance. When we become negative or fearful we attract that kind of thought and condition. We must be sure of ourselves; we must be positive; we must not be aggressive, but absolutely sure and poised within. Negative people are always picking up negative conditions; they get into trouble easily: Persons who are positive draw positive things; they are always successful. Few people realize that the law of thought is the great reality; that thoughts produce things. When we come to understand this power of thought, we will carefully watch our thinking to see that no thought enters that we should not want made into a thing.

In short, it is our deep fear and expectation that the printer will break down when we need it the most, that makes it happen. Get to the root of that belief that the question presupposes.

Holmes goes on to say:
*We can guard our minds by knowing that no negative thought can enter; we can daily practice by saying that no race thought of limitation can enter the mind; that Spirit forms itself around us and protects us from all fear and from all limitation. Let us clothe ourselves in the great realization that all power is ours and that nothing else can enter; let us fill the atmosphere of our homes, and places of business with streams of positive thought. Other people will feel this and will like to be near us and enter into the things that we enter into. In this way we shall be continually drawing only the best. *