Rabbi Mizrachi (I think) also explained it as loyalty, and any Rabbi I've asked which one of the three it meant always said "a bit of all".
The one thing I do remember for sure from Rabbi Mizrachi is that he said if you have a neighbor next door who is your best friend, and you lost the key to your house, while you may not know for sure or have any proof after you're done calling and asking him to come bring the spare, you should have confidence in him that he will because he's done it so many times before. That's like Emmunah in Hashem. I also just realized that Rabbi Mizrachi explained it as confidence, but I'm still not sure which Rabbi said it was loyalty.