Dhamma Padaya – Marga Waggaya
When a person begins to contemplate wisely and consciously, he recognises that everything in this world that he grasped thinking as ‘I-mine-my soul’, as well as his previous thoughts of willingness and reluctance, does not remain the same as he wished.
As soon as he realises that he had to suffer because of the inconstant nature of his attachments, he becomes frustrated with all those attachments.
That kind of frustration is what leads him to ‘Nirwana’.