The bliss of the elect in heaven would not be perfect unless they were able to look across the abyss and enjoy the agonies of their brethren in eternal fire.
And here we must narrowly watch ourselves, seeing that banquets can scarcely be celebrated blamelessly, for almost always luxury accompanies feasting; and when the body is swallowed up in the delight of refreshing itself, the heart relaxes to empty joys.
The holy universal Church teaches that it is not possible to worship God truly except in Her and asserts that all who are outside of Her will not be saved.