"Energy is never created or destroyed" is one way of stating the law of this "of energy"
... [2
] "Energy is again often stated to be only associated with matter,... [DOC] [TLE] Human Ecology, Persistence and Change, and the Laws of ... [PAR] One may also locate legitimate roots for the laws of thermodynamics in those who 
... the same through all natural processes, regardless which way one goes in time
.