Adopt the three mottos of the Fianna.
They had three mottos:
Glaine ár gcroí (Purity of our hearts)
Neart ár ngéag (Strength of our limbs)
Beart de réir ár mbriathar (Action to match our speech)
This refects the Mottos of many warrior cultures. Very similar to the Japanese Samurai, or the Spartan warrior culture, the Knights of Europe, The Roman Legionnaires.
Of course cultures have their differences, but they all have reflections that are similar. The above Mottos we can learn from.
Meditate on these.