Love can be alot. Like when my brother got a girlfirend and I asked; "who do you love more? Me or her?" and he said: "I love you both, but I love her in another way." we have different way of love for others. I love people. But "People" is just a title. when it comes to one specific person, it will be something else. If that one specific person only want to do you harm, then I'm sure you dont love him/her. 

When you love one - you love everyone.

I think it is not true. The sentence is self contradictory. 

Suppose you love one, then according to second part of the sentence, you love every one which contradicts the first statement that you love one :)

It might be true for me , For example I adore my mom and she learn me to love people .

If you are surrounded by love, you get positive energy and you are able to spread it around you to others.

Insofar as love makes one blind....