The Grammar of Quench

The sentence of mortality ends with a period. 
Dehydration rolled into one round sound: old. 
If I slake my thirst, I prod my prostate to rebel. 
If I desire to sin I send my soul reeling to the 
Desert, deserted. If I seek the phantasm oasis 
Wavering on the horizon, I sink in sands of my 
Own inadequacy. Such has my existence been  
Designed by Almighty God as end for man in 
Single drink he seeks, immortality, which lies  
On the sky in a horizon he stumbles towards  
Daily, seeing his God as mirage or true sight,  
Holding in his hand the glass of cool water  
            He seeks, unending glass of Sacrament,  
            Liquid he needs, incessant contentment.