We are reminded to rejoice not because we have been given authority to tread on serpents and scorpions and over all the power the enemy but because OUR NAMES ARE WRITTEN IN HEAVEN!!!!!
Luke 10:19-20English Standard Version (ESV)
19 Behold, I have given you authority to tread on serpents and scorpions, and over all the power of the enemy, and nothing shall hurt you. 20 Nevertheless, do not rejoice in this, that the spirits are subject to you, but rejoice that your names are written in heaven.”