When to delight and when not to delight?

Namo Buddhaya. During various discourses , monks after hearing Buddha delighted or did not delight. This is one discourse in which Monks did not delight at the end. In almost all other discourses , monks delight at the end. There are various places in which Buddha has given directions to the monk on when to delight and when not to delight. For example: One should not delight in sensual pleasures,One should not delight in any form. etc. Modern day Gurus like Sri Sri Ravi Shankar say one should always delight or be always happy. Honestly I take delight in posting to this forum.But should I take delight? My question is : Is there any direction given to Monks by Buddha on when to delight and when not to delight ?