You have not lost someone close to you, but you have experienced suffering- you know what it is like. Furthermore, you know from other sources (or could know if you wanted to) what it is like for people to lose a loved one. Take for example C.S. Lewis's book A Grief Observed. It provides unique insight in the experience of losing a loved one. Lewis allows you to have a look at what he has experienced subjectively. We can get similar insight from other, books, movies, plays etc. We can also get insight from those who we know. When your friend loses a loved one you are in some ways party to it. You grieve with them. All this points to the fact that we can have genuine insight into that which we have not experienced directly.
"Furthermore, by these presents [this law], in virtue of Our Apostolic authority, We grant and concede in perpetuity that, for the chanting or reading of the Mass in any church whatsoever, this Missal is hereafter to be followed absolutely, without any scruple of conscience or fear of incurring any penalty, judgment, or censure, and may freely and lawfully be used. Nor are superiors, administrators, canons, chaplains, and other secular priests, or religious, of whatever title designated, obliged to celebrate the Mass otherwise than as enjoined by Us. We likewise declare and ordain that no one whosoever is forced or coerced to alter this Missal, and that this present document cannot be revoked or modified, but remain always valid and retain its full force - notwithstanding the previous constitutions and decrees of the Holy See, as well as any general or special constitutions or edicts of provincial or synodal councils, and notwithstanding the practice and custom of the aforesaid churches, established by long and immemorial prescription - except, however, if more than two hundred years' standing."
"Accordingly, since it would be difficult for this present pronouncement to be sent to all parts of the Christian world and simultaneously come to light everywhere, We direct that it be, as usual, posted and published at the doors of the Basilica of the Prince of the Apostles, also at the Apostolic Chancery, and on the street at Campo Flora; furthermore, We direct that printed copies of this same edict signed by a notary public and made official by an ecclesiastical dignitary possess the same indubitable validity everywhere and in every nation, as if Our manuscript were shown there. Therefore, no one whosoever is permitted to alter this notice of Our permission, statute, ordinance, command, precept, grant, indult, declaration, will, decree, and prohibition. Should know that he will incur the wrath of Almighty God and of the Blessed Apostles Peter and Paul."
Given at St. Peter's in the year of the Lord's Incarnation, 1570, on the 14th of July of the Fifth year of Our Pontificate.
See, no way to misinterpret this.