Where there is peace and meditation, there is neither anxiety nor doubt.
Mental purity will come through constant chanting of the divine name. This is the simplest way. You are trying to cross the ocean of transmigration, the cycle of birth and death. The mantra is the oar of the boat; it is the instrument you use to cross the samsara of your restless mind, with its unending thought waves. The mantra can also be compared to a ladder that you climb to reach the heights of God realization.
As a broken microphone cannot broadcast a message, so a restless mind cannot transmit prayers to God
I am restless. I don't mind leaving this comfortable, static life. I could live a year on my own in a remote village.
Yoga is the method by which the restless mind is calmed And the energy directed into constructive channels.