Dhammapada verses 11 and 12

11. Those who mistake the unessential to be essential and the essential to be unessential, dwelling in wrong thoughts, never arrive at the essential.

12. Those who know the essential to be essential and the unessential to be unessential, dwelling in right thoughts, do arrive at the essential.

– Dhammapada I – Yamakavagga: Pairs 11 – 12