“The duration” could be twenty years or fifty. In our own era, the campaign to eliminate the killing of unborn children has already taken thirty-four years.
And that is just one battle: Christians are fighting as well modern slavery, embryo-destructive research, and the attack on marriage. We had better take a lesson from Wilberforce (and Wesley) and roll up our sleeves—permanently, if necessary.
Like Wilberforce, we must work to change the hearts of our fellow citizens. And like Wilberforce, we must never give up, but “go on in the name of God,” persevering until the battle is won.