Love manifests its reality in ...

Love manifests its reality in deeds, not only in words—these alone are without effect. In order that love may manifest its power there must be an object, an instrument, a motive.
There are many ways of expressing the love principle; there is love for the family, for the country, for the race, there is political enthusiasm, there is also the love of community of interest in service. These are all ways and means of showing the power of love. Without any such means, love would be unseen, unheard, unfelt—altogether unexpressed, unmanifested! Water shows its power in various ways, in quenching thirst, causing seed to grow, etc...
We must find a way of spreading love among the sons of humanity.
Love is unlimited, boundless, infinite!
The perfect love needs an unselfish instrument, absolutely freed from fetters of every kind.

Abdu'l-Bahá. Paris Talks