1 John 5:11 And this is the testimony: that God has given us eternal life, and this life is in His Son.
We have a life on earth that will not last too long; mankind is learning a lot and extending that life, but it is still limited because our genes and bodies get corrupted.
God has given us the gift of an eternal life without corruption if we should go to Him and ask Him to forgive us of our wrong-doings. Those sins are what bring us down.
But Through what Christ has done for us on that cross, we are able to have an incorrupt, eternal life with Christ our Lord and God in heaven!