Fudo-Shin is the state of enlightenment after successful and complete devotion and application of Karate-Do: the way; the state of balance and completeness. It is an unattainable goal and a way of continual improvement.

Fudo:
external : stability (static), balance (dynamic), force (power)
internal : concentration of energies (focus of will)

Shin : signifies spirit (soul)

Fudo-Shin, as guiding principle, defines the higher meaning of martial arts. Which way to choose to attain Fudo-Shin is less important than the devotion to reach it. Just be careful to keep your goal in mind, and your mind on the goal.