We address to example from our life. You go on car. That its moves before purpose of the journey? About wheels and motor we'll not speak - this is simply converting and sending elements. The obvious answer in 100% events - an energy got at fuel combustion.. The result of chemical reaction... The internal energy of fuel... And here all ended. But that means "the internal energy"? Let's look at this with the other standpoint. Energy is spent when execution of any work. Herewith we observe a change of the source of energy. It is possible to say that if the source of energy does not change then it possesses only potential ability to make a work. Only changes of the source allows to make a work. This work does changes the receiver - an object(s) of its exhibit. Practically, the source will send to receiver it's own change. Changes of the source and receiver are occurs at time. Since, each object exists in its cycle of time, it is possible to draw a conclusion: A SOURCE SENDs to RECEIVER ITS TIME. Really at fuel combustion ( in example with car ) a cycle of existence of the source (benzine) does ends. It changes in a new object - a products of combustion. Time of fuel goes to the other object through a zero point- a heat (light practically) radiation.