When philosophers get to talking about the prerequisites for virtue, you can expect one of two reactions. The 'So what else is new?' reaction is more common. Because, you have heard it from childhood and from people who, in their actions, seem well versed in ignoring that advice. The other one, more polite perhaps, is where the person says 'Oh! THAT may have been true in your times. The world has changed now' where you are actually being given the credit for not exactly being wrong. Only out of step with the times.
Tiru says this...
Kadhamkaaththu katradangal aatruvaan sevvi arampaarkkum aatrin nuzhaindhu - Tirukkural
Virtue enters the life of the man who controls his anger, possesses learning and practises restraint - Loose Translation
Actually, this is where the modern chappies pop in and asks, "Who really wants virtue? It's success we want and, if virtue happens to come in, fine. Otherwise..." The problem, though, is that people forget that 'success', in any time, happens to involve social recognition. And THAT, it so happens, is a function of how people view you. Of course, it is also true that even other forms of success - money, power, what have you - will require people helping you along the way and for that to happen you need to be looked upon as...err...virtuous, though they will not exactly use that term. 'Good team man', 'has leadership qualities' and so on...what's all that but people seeing you as possessing the necessary virtues?
So, yeah, you do need to possess learning, that's almost a given. (Call it skill-set or whatever, if it makes you feel all modern). But you need also to ensure that the learning does not give you a swollen head. Restraint, in this sense, also means that you should keep a rein on your tendency to go all 'I know more than you do'. In a sense, restraint is a leash on your ego. Being confident is one thing, being arrogant is another. So, alongside the learning, you also need to practise humility.
Now, actually, if you succeed in controlling your ego, controlling anger is almost redundant. Most of anger arises out of hurt ego and, well, that's exactly what is less likely to happen if your ego is controlled. But since the whole thing is a process and you ought not to allow your anger free rein till such time as you control your ego....
AND, really, controlling your ego till such time as you end up losing it altogether is what Indian spirituality is all about. So, of course, virtue walks in if you succeed.