Often a non-Christian knows something about the earth, the heavens, and the other parts of the world, about the motions and orbits of the stars and even their sizes and distances... and this knowledge he holds with certainty from reason and experience. It is thus offensive and disgraceful for an unbeliever to hear a Christian talk nonsense about such things, claiming that what he is saying is based in Scripture. We should do all that we can to avoid such an embarrassing situation, which people see as ignorance in the Christian and laugh to scorn.
Trials and tribulations offer us a chance to make reparation for our past faults and sins. On such occasions the Lord comes to us like a physician to heal the wounds left by our sins. Tribulation is the divine medicine.
Whoever seems to himself to have understood the Scriptures in such a way that he does not build up that double love of God and neighbor has not yet understood.
Consequently, heretics and schismatics, separated from the unity of this Body, are able to receive the same Sacrament, but with no benefit to themselves; indeed, more to their own harm, in that they are judged the more severely rather than being liberated.
Try as they may to savor the taste of eternity, their thoughts still twist and turn upon the ebb and flow of things in past and future time. But if only their minds could be seized and held steady, they would be still for a while and, for that short moment, they would glimse the splendor of eternity, which is forever still.
What then, is correctness of speech but the maintenance of the practice of others, as established by the authority of ancient speakers? But the weaker men are, the more they are troubled by such matters. Their weakness stems from a desire to appear learned, not with a knowledge of things, by which we are edified, but with a knowledge of signs, by which it is difficult not to be puffed up in some way; even a knowledge of things often makes people boastful, unless their necks are held down by the Lord's yoke.