I found this little book of (often insipid) quotations a long time ago and the only thing that the former owner had underlined was this quote:

We can’t choose happiness. We can only choose whether we will indulge ourselves in the present moment or whether we will renounce that for the sake of obeying the divine voice within us- for the sake of being true to all the motives that sanctify our lives. I know this belief is hard but I have felt that if I let it go forever, I should have no light through the darkness of this life.
– George Eliot