Spiritual realm and what it takes to enter it

"The spiritual world, huh?" Claire muttered, looking up to the ceiling as if her eyes could pierce it and reach the sky. She kept her head in this position for a while, likely sorting her thoughts out before lowering it back down and looking into my face. 

Yet, rather than continuing with her explanation, Claire simply stared me right in the face with a deep, profound look on her face.

"Do you know what is the one thing that humans have been trying to achieve since times immemorial?" 

I squinted my eyes a bit. 

"Power? Richess?" I quickly guessed, only for Claire to shake her head with a small, faint smile. 

"You need to think... bigger," she advised, only to string her eyebrows together before shaking her head a little and backtracking on her words. "No, not bigger. Greater." 

This time, I actually gave Claire's question a little more thought, searching beyond what appeared like a random, obvious answer.