9 Love must be sincere. Hate what is evil; cling to what is good. 10 Be devoted to one another in love. Honor one another above yourselves. (Romans 12:9-10 NIV)
We toss words around pretty freely. Expecially words like love. However, sincere love will result in devotion and setting others before ourselves.
Sincerety is something that comes through in our actions more than our words. When we act out of love and in sincerity others feel the depth of our feelings through our actions.