In order to progress in devotion we have to learn the workings of the mind, popularly known as human psychology. So a good bhakta is a good psychologist.
If your activity is pleasing to Krishna it gives devotion and promotion else its commotion.
Sarcasm is just a manifestation of our hidden envy.
Always go beyond the mind's limitations. If you do what your mind says you can, you will not end up doing anything.