To me, it means that He showed humans the path (the human life), which suggests a journey and constant effort to attain the truth that will lead to eternal life. It also means that these three are inseparable as they come together in His form. I also think, in this sense, that the phrase alludes to the triadic form (Father, Son, Holy Spirit).
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"Caminante, no hay camino,
se hace camino al andar", Antonio Machado
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