Do not be daunted by the enormity of the world’s grief.
Do justly, now.
Love mercy, now.
Walk humbly, now.
You are not obligated to complete the work,
but neither are you free to abandon it.
[Talmud]

I wrote a review! I like this book a lot. If you read scholarly books and/or you like Chesterton, it is well worth the time.