How do you know if you are in a "state of grace"?

How do you know if you are in a state of grace?

I like St. Joan of Arc’s answer to the question, “Are you in a state of grace?”

If I am not in the state of grace, may God put me there; and if I am, may God so keep me.

What her answer implies is neither absolute certainty, nor despair, but trust in God to protect her.

DISCLAIMER: The views and opinions expressed in these forums do not necessarily reflect those of Catholic Answers. For official apologetics resources please visit www.catholic.com.