I am.......

I am the moon,
I am the sky,
I am the reason we ask why,

I am I,
I am we,
I am everything we wish to be,

I am your love,
the hope in your heart,
I am what comes through in your art,

I am a lie,
a half-hearted attempt,
I am a secret that is well kept,

I am telling the truth,
I am telling a lie,
Answer one question,
Who am I?