I believe there will be more in heaven than in hell. If you ask me why I think so, I answer, because Christ in everything is to have the preeminence (Colossians 1:18), and I cannot conceive how he could have the preeminence if there are to be more in the dominions of Satan than in paradise.
Moreover, it is said there is to be a multitude that no man can number in heaven (Revelation 7:9). I have never read that there is to be a multitude that no man can number in hell.
I rejoice to know that the souls of all infants, as soon as they die, speed their way to paradise. Think what a multitude there is of them! And then there are the just and the redeemed of all nations up till now. And there are better times coming, when the religion of Christ shall be universal. And in the thousand years of the great millennial state there will be enough saved to make up all the deficiencies of the thousands of years that have gone before.
~ Charles Spurgeon, “Heavenly Worship,” Sermon 110