'Eternal' in the Bible

But he that shall blaspheme against the Holy Ghost hath never forgiveness, but is in danger of eternal damnation:

And when he was gone forth into the way, there came one running, and kneeled to him, and asked him, Good Master, what shall I do that I may inherit eternal life?

But he shall receive an hundredfold now in this time, houses, and brethren, and sisters, and mothers, and children, and lands, with persecutions; and in the world to come eternal life.