De acquirenda, retinenda, et amittenda possessione enunciationes C

LII.
By reason of the person: that is, that one should frame his mind so that he wishes to hold the thing in his own name and for himself.

LIII.
Whence the usufructuary a person who has the legal right to use and derive profit from property belonging to another, the vassal, the emphyteutic tenant a holder of a perpetual lease, the borrower, the depositary, and the pledge creditor merely hold detinent detain/physically hold and do not possess.

LIV.
By reason of the thing possessed: namely, that the thing must be certain. For we do not possess an uncertain thing.

LV.
Error also pertains to this, that we should not be mistaken. For error stands against possession.

LVI.
And these things, indeed, are considered generally in the acquisition of any possession. Furthermore, for civil possession, besides the aforementioned, other things are also necessary: namely, a title, good faith, and delivery made by the previous possessor.

LVII.
We take title here as the cause for possessing.

LVIII.
It is necessary, however, that it be not a simple, but a just title.

LIX.
That which is fit for the transfer of ownership is called just.

LX.
Such as that by gift, by purchase, by inheritance, by possession of goods, or by legacy.

LXI.
Which, however, sometimes even a putative supposed/presumed title suffices.

LXII.
One can possess from several causes.