It is a very powerful sentence. Love automatically refers to one being kind and generous to the loved one. Serve means that one is happy to serve a loved one. Lastly giving one’s loved one makes one happy. The answer here is that to love, serve and give completely to all.

Do everything in love. – Corinthian 16:14

As each has received a gift, use it to serve one another, as good stewards of God’s varied grace. – Peter 4:10

Each of you should give what you have decided in your heart to give, not reluctantly or under compulsion, for God loves a cheerful giver. And God is able to bless you abundantly, so that in all things at all times, having all that you need, you will abound in every good work. – Corinthians 9:6-8

There it is in a nutshell from Bible.

Swami Sivananda loved everyone. He washed feet of the sick, diseased and poor. He served them unhesitatingly and gave them warmth, food, and shelter. At the ashram his disciples often went without food, because there were hungry persons outside the ashram. And yet at the same time he remembered what each one of them liked. When Swami Satyananda was on night duty, he would bring him a cup of coffee as knew that he loved coffee and it kept him awake. Atmabhava was his main teaching, love your fellow beings. When you love then you are serving and giving them.

If we can love unconditionally, it is possible to serve and give.

Aim Hrim Klim