Eternal

as it it used in this verse,
means,


Endless; without end;
immortal.

I am the Good Shepherd:
the Good Shepherd gives his life
for the sheep...
My sheep hear my voice, and I know them and they follow me: And I give them eternal life, and they shall never perish, neither shall any man
snatch them out of  
my hand.   

John 10:11,   
27, 28