do you mean something like ad hoc, ad infinitum, something in latin but still used in juridic ,medical or archeological ......redaction

Hi, I think that you mean alternative words / phrases for self discipline
You can say, 'where there's a will there's a way' or willpower or determination. Am I right?

self control
self-knowledge
perseverance
diligence
dedication
persistence
determination
effort
blood, sweat and tears

Stuff like that. :P

self-control
self-restraint
self-denial
self-training
self-grooming
self-inhibition
self-command

Some of those that I have mentioned may not exactly coincide with what you have in mind. But then, you didn't give the context. It would be better next time to include the context so we can hit the jackpot and bring home the bacon.