Inadequate: lacking the quality or quantity required; insufficient for a purpose.
Incapable: unable to do or achieve (something).
Incapable is the output. The what.
Inadequate is the reason. The why.
All of us are guilty of stopping at the what, whenever we fail.
I am incapable
I can’t do it
I don’t have what it takes
Only a few of us penetrate the why
Why am I incapable
Why can’t I don’t it
Why don’t I have have what it takes
In my experience, surrounding yourself with circumstances and people that make you feel inadequate, will magically ensure that you don’t remain incapable over a prolonged period of time.
But we rarely do
Again, ask why!