Witness
For those who don't believe in coincidences, I was thinking about this statement earlier today, which I did not know came from Cardinal Suhard, in the context of chewing over something from Pope Francis's homily yesterday, then I came across it in a piece on Dorothy Day, which I found linked to because Pope Francis mentioned her in his speech to Congress:
To be a witness ... means to live in such a way that one’s life would not make sense if God did not exist.