A sword by itself does not ...

A sword by itself does not slay; it is merely the weapon used by the slayer.
A sword by itself does not slay; it is merely the weapon used by the slayer.

More phrases

Who sows virtue reaps honor.
He who conquers himself is the mightiest warrior.
The fixed determination to have acquired the warrior soul, to either conquer or perish with honor, is the secret of victory.
 George S. Patton
We are all warriors. Each of us struggles every day to define and defend our sense of purpose and integrity, to justify our existence on the planet and to understand, if only within our own hearts, who we are and what we believe in.
 Steven Pressfield
See first with your mind, then with your eyes, and finally with your body.
 Yagyu Munenori

Quotes from the same author

If one does not know to which port one is sailing, no wind is favorable.
One of the most beautiful qualities of true friendship is to understand and to be understood.
Luck is what happens when preparation meets opportunity.
The conditions of conquest are always easy. We have but to toil awhile, endure awhile, believe always, and never turn back.
Begin at once to live and count each separate day as a separate life.