Here are some pithy quotes to ponder:
Permanence, perseverance and persistence in spite of all obstacles, discouragements, and impossibilities: It is this, that in all things distinguishes the strong soul from the weak. (Thomas Carlyle)
Life is not easy for any of us. But what of that? We must have perseverance and above all confidence in ourselves. We must believe that we are gifted for something and that this thing must be attained. (Marie Curie)
In other words, keep on keeping on!