'Eternal' in the Bible

And if thy hand or thy foot causeth thee to stumble, cut it off, and cast it from thee: it is good for thee to enter into life maimed or halt, rather than having two hands or two feet to be cast into the eternal fire.

And behold, one came to him and said, Teacher, what good thing shall I do, that I may have eternal life?

And every one that hath left houses, or brethren, or sisters, or father, or mother, or children, or lands, for my name's sake, shall receive a hundredfold, and shall inherit eternal life.

Then shall he say also unto them on the left hand, Depart from me, ye cursed, into the eternal fire which is prepared for the devil and his angels:

And these shall go away into eternal punishment: but the righteous into eternal life.