A love that is limited by time and space?

What does it mean by love- What is the chemistry that works within you when you think of a person? Whether the affection you have for your parents, the extra care you wanted to show on your children or the warmth you feel for a friend who does a lot to you or a feeling you have for a good samaritan neighbor with whom you discuss everything between a heaven and hell? What is the biochemistry involved in all these feelings? Do they all lead to love?

Do all these forms get limited by time or space? Yes I guess! Let me tell you, this (limited?) love is vain and is capable of deserting anybody at a moment's notice.

The only way to love (anyone) is to love without limiting anything. Isn’t this ‘love’ the emotion that really is ruling all of our lives after all? Be it the positive aspect or negative aspect (such as ill feeling or hatred) you need to take time (unlimitedly) to think of a person whom you hate even! Is not it? So why waste a precious life hating someone? Why can’t we start “loving” everyone, even a person whom we dread to think of without looking for reasons? Some one said that a smile is very contagious, I will change it, love is contagious and it can spread like virus and I love to see the world infected with this pleasant virus. Can it happen?
I wish Rama, Allah, Buddha, Jesus collectively do that!