user11259: What are the differences between faith/devotion and fides (deities)? 

user254: There was a discussion of "faith" in Buddhism in these topics.
My summary of this answer is that "faith" in early Buddhism is similar to the faith you have in a doctor: you take medicine because you believe it will work, because you hear it will work, because the doctor recommends it.
The fides you mention isn't a Buddhist term, is it, nor a translation of the Buddhist term? I think that the Latin word fides implies the kind of faith you find in faithfulness: if you're a "faithful husband" or wife, for example, then I think that means you make yourself reliable, predictable, trustworthy, constant ... keeping promises ... you see that in the English word "fidelity".

11259: <p>What are the differences between faith/devotion and <a href="https://en.wikipedia.org/wiki/Fides_(deity)" rel="nofollow noreferrer"><em>fides</em></a> (deities)? </p>
 254: <p>There was a discussion of "faith" in Buddhism in <a href="https://buddhism.stackexchange.com/questions/tagged/faith">these topics</a>.</p>

<p>My summary of <a href="https://buddhism.stackexchange.com/a/3694/254">this answer</a> is that "faith" in early Buddhism is similar to the faith you have in a doctor: you take medicine because you believe it will work, because you hear it will work, because the doctor recommends it.</p>

<p>The <em>fides</em> you mention isn't a Buddhist term, is it, nor a translation of the Buddhist term? I think that the Latin word <em>fides</em> implies the kind of faith you find in faithfulness: if you're a "faithful husband" or wife, for example, then I think that means you make yourself reliable, predictable, trustworthy, constant ... keeping promises ... you see that in the English word "fidelity".</p>
