If a certain activity is performed without inspiration and without understanding its value, could it still be considered a service to God? We may not feel inspired and we may not understand the value of a particular activity, but that does not mean that the activity given to us is not service to Krishna. It may be service, if it was given to us by a devotee fixed in devotional service. But the value of that service can be determined in relation to the desire we have in our hearts to please that devotee. If the devotee is dear to us, and if he inspires us to take shelter in any one of the nine processes of devotional service, then pleasing that devotee will be something valuable to us. If it is valuable, we will naturally be inspired to perform the service.
(Collected Letters to My Disciples, Vol 3, Pg 87, 2nd Paragraph)