Eternity has been revealed to all, but God has prepared things that only those that love Him will experience.
Be sure to understand His definition of how to love Him.
Romans 1:20 For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:
Ecclesiastes 3:11 He hath made every thing beautiful in his time: also he hath set the world (eternity) in their heart, so that no man can find out the work that God maketh from the beginning to the end.
1Corinthians 2:9 But as it is written, Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him.
John 14:21 He that hath my commandments, and keepeth them, he it is that loveth me: and he that loveth me shall be loved of my Father, and I will love him, and will manifest myself to him.