In the preliminary phase of spiritual life there are diffrent kinds of austerities, penances and similar processes for attaning self-realization. However, even if an executor of these processes is without any material desire, he still cannot achieve devotional service and aspiring by oneself alone to achieve devotional service is also not very hopeful, because Krishna does not agree to award devotional service to merely anyone. Krishna can easily offer a person material happiness or even liberation, but he does not agree very easily to award a person engagement in His devotional service. Devotional service can in fact be attained only through the mercy of a pure devotee.
Devotional service is not a job, it is a privilege.
The child cries to have toys, but one who can cry for the Lord in love is certainly successful in the line of devotional service.
Whatever devotional service we may have, we do it for seeking the shelter of the Lord, not for our mental or physical enjoyment.
Teach them Krishna Conscious Art at early age, so they may advance in devotional Service.