Service does not mean I do what I want, when I want. Sevice means, I do whatever makes Krishna happy.
Our supreme duty is to serve the residents of Vraja who are afflicated by Krishna ‘s departure to Mathura.
Service is also kirtana. Only singing is not kirtana. Then it automatically turns into remembering. This is the by-product.
Devotee do not want liberation, they only want to serve. Service here or service there doesn't matter. 'Let me always serve you', that is the mood of a devotee.
The different parts of a body work selflessly to serve one another and keep the body healthy. Similarly, a healthy society is one in which the different sections serve each other instead of selfishly trying to enjoy by themselves.
The more we make advancement in spirituality, the more we need to strengthen our service attitude, in order to bear the weight.