Guru Nanak, the first of the Sikh Gurus, travelled far an wide to teach his message of ik onkar meaning one God. Here is one of his beautiful Hymns about repeating God’s name.

Passage

The saints worship God with love; they thirst for the truth, and hear it with excessive love.
They who cry aloud in trouble obtain rest by prayer and heartily loving God.
O man, repeat God’s name and seek His protection.
Repeat God’s name and do good works; thus shalt thou cross over the ocean of the world.
O mortal man, to repeat God’s name under the Gurus instruction is a happy thought.
By mentally repeating God’s name one’s mind obtaineth a treasure of real divine knowledge and peace.
In this world man’s fickle mind pursueth wealth and becometh intoxicated with worldly love;
Bat, on being imbued with the Guru’s word and teaching, God’s name and service become firmly implanted in the heart.
Doubts which ruin the world by the disease of transmigration, cease not by wandering to places of pilgrimage.
The place of God is the abode of unmixed happiness; he who is truly wise repeateth God’s name as his penance.
Every one is saturated with worldly love, and therefore endureth the great pain of birth and death.
Man shall be saved by hastening to the asylum of the true Guru and repeating God’s name in his heart.
Man’s mind becometh stable, and he practiseth divine meditation under the Guru’s instruction.
Pure is the heart which containeth truth and the excellent jewel of divine knowledge.

Max Arthur MacAuliffe. The Sikh Religion. Oxford University Press, 1909.