I’m always amazed by what we can get from (or better, by what God can do with) a “mere” Christianity.
Creatures are not born with desires unless satisfaction for these desires exists. A baby feels hunger; well, there is such a thing as food. A duckling wants to swim; well, there is such a thing as water. Men feel sexual desire; well, there is such a thing as sex. If I find in myself a desire which no experience in this world can satisfy, the most probable explanation is that I was made for another world. (Mere Christianity, Bk. III, chap. 10, “Hope”)
“What no eye has seen,
what no ear has heard,
and what no human mind has conceived”—
the things God has prepared for those who love him—
these are the things God has revealed to us by his Spirit.(1 Co 2:9–10)