There is no happiness like that of being loved by your fellow-creatures, and feeling that your presence is an addition to their comfort.
After so much solitude, Jane values ordinary warmth. The line reframes love as shared daily comfort, not only passion. “Fellow-creatures” sounds humble and expansive at once. Brontë suggests that dignity grows in the soil of mutual regard. The sentence is modest, which makes it convincing. It fits the novel’s ethic: love proves itself by care. This happiness is not dramatic—but it lasts. It’s the home Jane has been building toward.