first law of thermodynamics: energy can neither be created nor destroyed, only altered in form. the cycle of life is endless. 

ΔU = ΔQ + ΔW

An "ouroboros" is a circular symbol that depicts a snake or dragon devouring its own tail and that is used especially to represent the eternal cycle of destruction and rebirth. 

a blooming flower - new life. 

the phases of the moon - darkness comes and goes, forever. where there is darkness now, there will soon be light. 

"life after life" expresses that life is transient yet the cycle of it is eternal. death, decay, life, and birth are all the shifting of matter and energy. even in death, life awaits. in all darkness, there is a light. 

energy is eternal