Love Begets Love
In life it is always possible that the people whom we consider as friends turn against us and similarly those whom we treat as enemies help us. So do not worry about others' activities. Continue to show your love to all irrespective of whether they are friendly or inimical. You should understand that love begets love.
Taken from the book "The Spider's Web, Vol. 2 (2013)", Chapter "Family Life", pg. 297, by Revered Chariji