It is analogous in some senses to the Bhakti movement in Hinduism and to the various Christian monastic movements such as that of St Francis of Assisi. The Sufi path consists in cleansing the heart from whatever is other than Allah.
A Persian poem tells us what The Sufi Path (Tasawwuf ) is:
What is Tasawwuf? Good character and awareness of God.
That’s all Tasawwuf is. And nothing more.
What is Tasawwuf? Love and affection.
It is the cure for hatred and vengeance. And nothing more.
What is Tasawwuf? The heart attaining tranquility–
which is the root of religion. And nothing more.
What is Tasawwuf? Concentrating your mind,
which is the religion of Ahmad (pbuh). And nothing more.