A book by Luigi Giussani, and is part of a three-part series meant to communicate the reasonableness of "the Christian fact". In this volume, he does it more precisely through one's experience of one's own humanity. 

Some parts from it which I noticed, and decided to point out :) 

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"You don't know what you talking about. Ain't not way possible for you not to believe in God. It ain't up to you."

"Who's it up to then?"

"It's up to the life in you - the life in you. That knows where it comes from, that believes in God."

The human being- the concrete human person, me, you - once we were not, now we are, and tomorrow will no longer be: thus we depend. And either we depend upon the flux of our material atecedents, and are consequently slaves of the powers that be, or we depend upon what lies at the origin of the movement of all things, beyond them, which is to say, God. 

The awe, the marvel of this reality which imposes itself upon me, of this presence which reaches me is at the origin of the awakening of human consciousness.

...the very first sense of the human being is that of facing a reality which is not his, which exists independently of him, and upon which he depends. Empirically translated, it is the original perception of a given.

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