Be not content with showing friendship in words alone

This quotation by 'Abdu'l-Bahá is a constant reminder to me not to let conventionality and superficiality characterize my relations and dealings with my fellow men:

"Do not be content with showing friendship in words alone, let your heart burn with loving kindness for all who may cross your path."
- Paris Talks

Whether it be in the people I met, whether friend or stranger, in my communications (email, text messages etc.), or speaking on the phone, I must make sure that the addressee can sense that "[burning] with loving kindness" for them.

I learned it as part of a Study Circle, whose lessons are meant to stay with us for this life, and even the next!