What impels us to cast off the unfruitful works of darkness?...

Our salvation is at hand. The "salvation" being looked for is the coming of the Lord Jesus to punish the wicked and reward the righteous.

For the righteous, the coming of the Divine salvation will mean an end of suffering and entrance into the fullness of joy and peace. For those who have obeyed the Holy Spirit in putting to death the deeds of their body the coming of salvation will mean the removal of the last traces of sin and the receiving of a body that loves righteousness instead of sin.

For the wicked, the coming of salvation will mean outer darkness—or worse!

The Judge stands at the door. Christ is soon to appear and He will judge each of us according to the works we have practiced in the world, whether they have been good or evil. We shall be recompensed according to our works.

What we sow in the world we shall reap in the Day of the Lord.