Sri Chinmoy: If you start thinking about how to love God, you will never be able to do it. Love has to be spontaneous. When you enter into a garden, you do not have to think about how to appreciate the beautiful flowers. Immediately you will smell their fragrance and see their beauty. In the same way, we love God not by thinking, but by feeling. Feel that you have opened your heart-door. When you open up the garden gate, you do not have to run to a particular flower in order to appreciate it. Immediately you receive the purity and fragrance of all the flowers in the garden. Your heart is not just a tiny muscle; it is also a garden. Once you enter into your heart- garden, then definitely you will be able to see the Gardener, our Lord Beloved Supreme.
So you can start by imagining your heart- garden. Imagination is a world of its own. It is completely different from thinking. Thinking is constant contradiction. But when you imagine something very beautiful and soulful, it has tremendous reality, tremendous truth in it. To come back to your question, do not think of how to love. Just love. Love is already there inside your heart-garden.