Shyama Charan Lahiri (30 September 1828 – 26 September 1895), best known as Lahiri Mahasaya, was an Indian yogi guru who founded the Kriya Yoga school. In 1861, his non-physical master Mahavatar Babaji appeared to him, ordering him to revive the yogic science of Kriya Yoga to the public after centuries of its guarding by masters. He was unusual among Indian holy people in that he was a householder, marrying, raising a family, and working as a government accountant, an "Ideal yogi-householder." He became known in the West through Paramahansa Yogananda, a disciple of Sri Yukteswar Giri, and through Yogananda's 1946 book Autobiography of a Yogi, considering him a Yogavatar, or "Incarnation of Yoga," since Lahiri himself was chosen by the yogic masters to disseminate the principles of yoga to the world.

Kriya Yoga :-
The central spiritual practice which he taught to his disciples was Kriya Yoga, a series of inner pranayama practices that quickly hasten the spiritual growth of the practitioner. He taught this technique to all sincere seekers, regardless of their religious background. In response to many types of problems that disciples would bring him, his advice would be the same — to practice more Kriya Yoga. Regarding Kriya Yoga, he said:

Always remember that you belong to no one, and no one belongs to you. Reflect that some day you will suddenly have to leave everything in this world–so make the acquaintanceship of God now. Prepare yourself for the coming astral journey of death by daily riding in the balloon of God-perception. Through delusion you are perceiving yourself as a bundle of flesh and bones, which at best is a nest of troubles. Meditate unceasingly, that you may quickly behold yourself as the Infinite Essence, free from every form of misery. Cease being a prisoner of the body; using the secret key of Kriya, learn to escape into Spirit.

He taught that Kriya practice would give the yogi direct experience of truth, unlike mere theoretical discussion of the scriptures, and to Solve all your problems through meditation. Exchange unprofitable religious speculations for actual God-contact. Clear your mind of dogmatic theological debris; let in the fresh, healing waters of direct perception. Attune yourself to the active inner Guidance; the Divine Voice has the answer to every dilemma of life. Though man’s ingenuity for getting himself into trouble appears to be endless, the Infinite Succor is no less resourceful.

No matter what the disciple's problem, the guru advised Kriya Yoga for its solution.
I am ever with those who practice Kriya. I will guide you to the Cosmic Home through your ever enlarging spiritual perceptions.
Solve all your problems through meditation.

- Lahiri Mahasaya