Sure Thing

love
noun
\ˈləv\
: a feeling of strong or constant affection for a person
: attraction that includes sexualdesire : the strong affection felt by people who have a romantic relationship
: a person you love in a romantic way

(c) Meriam Webster

Love encompasses a range of strong and positive emotional and mental states, from the most sublime virtue or good habit, the deepest interpersonal
affection and to the simplest pleasure.

Love is also considered to be a virtue representing human kindness, compassion, and affection, as "the unselfish loyal and benevolent concern for the good of another.

(c) Wikipedia

Love is a complex set of emotions, behaviors, and beliefs associated with strong feelings of affection, protectiveness, warmth, and respect for another person.

(c) goodtherapy.org [Love according to Psychology]

It has been defined, but how would you know if it's love really ?
How would you recognize if it's real?
Is there an instruction to follow?
If you've found it already,how can you make it last?

Let's travel through time and bring back our good old days with the most permanent and sure thing on earth -- LOVE.