The emergence and blossoming of understanding, love, and intelligence, has nothing to do with any tradition, no matter how ancient or impressive - it has nothing to do with time. It happens on its own, when a human being questions, wonders, inquires, listens, and looks silently without getting stuck in fear, pleasure, and pain. When self-concern is quiet, in abeyance, heaven and earth are open. The mystery, the essence of all life, is not separate from the silent openness of simple listening.
The starting point of yogic inquiry, the basic question underpinning all yogic practice, is simply, "What are we?" Even the asana itself is an inquiry, asking in each asana, "Who am I?"
Through the asana, the practitioner throws out all the extraneous parts until only the Soul is left.
The final, correct asana is a true expression of "I am That, That is God." This expression is felt only when one approaches and performs asana within the framework of physical prowess (sakti), intellectual skillfulness (yukti), and devotion and worshipfulness (bhakti) in each asana.

To go on a journey, modes, such as travelling by bus or by train, travelling by boat or by plane, are largely uneccesary.

A monk asked his master to show him the way.
The master said, Have you finished your prayers?
Yes, replied the monk.
Then, go and wash your soul, instructed the master.

To practice zazen wholeheartedly is the attainment of the Truth itself. To practice zazen is Buddhism... Buddhism is to practice zazen.

Spiritual realization is the aim that exists in each one of us to seek our divine core. That core, though never absent from anyone, remains latent within us. It is not an outward quest for a Holy Grail that lies beyond, but an Inward Journey to allow the inner core to reveal itself.

Dogen's Zen is not the desire to become more than human, a special person, a Buddha or God. Nor is it in the hope of experiencing emptiness, or of performing miracles. It is a return to the normal condition of the human spirit.
The whole practice of yoga is concerned with exploring the relationship between Prakrti and Purusa, between Nature and Soul. It is about learning to live between the earth and the sky. That is the predicament, our joy and our woe, our salvation and our downfall. Nature and Soul are mingled together. Some would say they are married. It is through the correct practice of asana and pranayama and the other petals of yoga that the practitioner (sadhaka) experiences the communication and connection between them.
You can't just "try IT and see" anymore. IT won't work until you dedicate a portion, a part of your life to IT. This is the moment of choice.
We have only finite means to know the infinite. When the finite merges in the infinite, everything becomes infinite.
Consider the sky. The sky is finite as well as infinite. None can touch it, yet we are in contact with it at every moment of our lives. Similarly, you and I have to use finite means - body, mind, intelligence and consciousness - to reach the infinite seat of the soul which is the mother of all these things. In this way we remain ever fresh, ever peaceful, and with ever growing intelligence.