Yes.. very true.. if someone becomes happy with something, the other person will always try to do it and see a happy face......and that is love. may be it is of mother and son, brother and sister, or a love between he and she.
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It is making other people happy , is the most happiest way of enjoying real happiness.Love is universal, , it exists in every one and in every relationship. It is infectious, and the greatest energy for all.