"I rejoice in your words like one who finds a great treasure". These words are said by the Mohel before he starts his work  

Why is this commandment, which involves pain and sometimes even worries, awaken in us such great joy? Happiness is one of the most difficult feelings to describe, as is its opposite feeling – sadness. Often we feel "just in the mood" or, vise versa "not in the mood".  But in fact our moods are affected by the deep feelings of our soul, with every shift in its situation sending waves to the surface – to our conscious mind, which thinks and feels and affects us even on a subconscious level, without our knowledge

Sadness, any sadness, occurs when the soul's needs are not met. Happiness, any happiness, occurs when the soul receives exactly what it needs

Therefore, there is no greater joy for the soul than the fulfillment of the Brit, which for the soul is the fulfillment of all its needs and wants 

 During the Brit, the infant makes a pact of love with God, and in light of this new bond, all those gathered there receive a renewal of their own personal bond with God."Clogged pipes" are opened, dimmed candles are rekindled, forgotten treasures are rediscovered and the soul "dances" with joy.  We have no greater closeness, we have no greater joy