Whatever you are doing,
be master of your work.
-William Walker Atkinson, "A. P. Mukerji"

Consistency of practice
is the mark of a master.
-George Leonard

Whatever a master advocates,
he or she must practice it to a level
then times higher than his students.
-Deng Ming-Dao

Mastery is a power that one develops
by practicing it on oneself.
-Hazrat Inayat Khan

Ah, mastery...
what a profoundly satisfying feeling
when one finally gets on top of a new set of skills.
-Gail Sheehy

He that would govern others,
first should be master of himself.
-Philip Massinger

What can be higher than that
which is its own master?
-Plotinus

The truly great man is he who would master no one, 

and who would be mastered by none.

-Khalil Gibran

No man is free
who is not master of himself.
-Epictetus

I am the master of my fate;
I am the captain of my soul.
-William Ernest Henley

Why are we Masters of our fate,
the captains of our souls?
Because we have the power
to control our thoughts, our attitudes.
-Alfred A. Montapert

The mastery of the mind

is the mastery of the self.

-Paul Brunton

Wherever there's mastery,
there's no mystery;
wherever there's mystery,
there's no mastery.
-Yogi Bhajan