One should remain as a witness to whatever happens, adopting the attitude, 'Let whatever strange things that happens happen, let us see!' This should be one's practice. Nothing happens by accident in the divine scheme of things.
Ramana Maharshi
Sri Ramana Maharshi on the nature of the mind:
What is called the mind is a wondrous power residing in the Self. It causes all thoughts to arise. Apart from thoughts, there is no such a thing as mind. Therefore, thought is the nature of the mind.
Apart from thoughts, there is no independent entity called the world. In deep sleep there are no thoughts, and there is no world. In the states of waking and dream, there are thoughts, and there is a world also.
Just as the spider emits the thread (of the web) out of itself and again withdraws it into itself, likewise the mind projects the world out of itself and again resolves it into itself. When the mind comes out of the Self, the world appears (to be real), the Self does not appear; and when the Self appears (shines) the world does not appear.
When one persistently inquires into the nature of the mind, the mind will end leaving the Self (as the residue).
What is referred to as the Self is the Atman. The mind always exists only in dependence on something gross; it cannot stay alone. It is the mind that is called the subtle body or the soul (jiva).
Who Am I?
The Teachings of Bhagavan Sri Ramana Maharshi
Even the smallest feeling is said to be accompanied by craving, And craving produces all forms of clinging. The clinging in turn perpetuates all existence, And based on existence, one’s birth occurs.
~ Lalitvistāra sūtra
“The degree of freedom from unwanted thoughts and the degree of concentration on a single thought are the measures to gauge spiritual progress.”
— Ramana Maharshi.