Attachment is due to Moha. Attachment is the offspring of the quality of Rajas. Non-attachment is born of Sattva. Attachment is an Asuri-Sampat , demoniacal quality. Attachment is born of ignorance, selfishness and passion.
Attachment brings death.
Non-attachment is wisdom. Non-attachment brings freedom. Practice of detachment is a rigorous discipline indeed. You will have to practise it again and again. You may tumble down like a baby who is just learning to walk, but you will have to rise up again with a smile and a cheerful heart.