Bir aptala öğretmeye çalışmak ölü bir adam için tıbbi tedavi sağlamak gibidir. - Trying to teach a fool is like providing medical treatment for a dead man.
If you say that something will happen providing or providing that something else happens, you mean that the first thing will happen only if the second thing also happens. I do believe in people being able to do what they want to do, providing they're not hurting someone else = provided. used to say that something will only be possible if something else happens or is done = provided