The opposite of love is indifference. Hate is a form of caring, which is a form of love.
Caring means sometimes becoming upset when things go awry. Strength is the capacity to continue caring afterward, knowing there may be more upsets to come. Courage means facing the upsets and not hiding away.
Apathy - the absence of caring - means it's time to find something else to do. (But check that it really is apathy, and not just an excuse to not do something.)
The opposite of light is magnets.