In 2 Peter 1:3, the majority of manuscripts, including the earliest witness (P72), read about 'him who called us through glory and virtue'. About 25 Greek manuscripts, however, read 'him who called us by his own glory and virtue'. Crucially, this second reading is found in the all of the geographically diverse early versions into Latin, Syriac and Coptic, while the first reading is found in none of them.
Added to this is the fact that the second reading makes more sense: Christ called us by his own personal glory and virtue. We can understand why someone like Peter was attracted to Christ - there was something totally compelling about following a brilliant person like Christ (and 'virtue' is a favourite word used by Peter in his letters). By comparison, the first reading seems like vague and colourless religious waffle: what exactly does it mean that we were 'called by glory and virtue'?
Therefore, we should prefer the reading that makes more sense in context and that is found in more diverse witnesses.