Yah pashyati tathaa’tmaanam akartaaram sa pashyati.
He sees, who sees that all actions are performed by Nature through this body alone and that the Self or the soul is actionless . This is also said by vedmantra as this jeevatma being very selfish in its nourishment ,prevents from spirituality which links with the parmatma and hence first bird which eats the fruits is jeevatma and the second bird which is mere spectator is mann or mind .
Krsn therefore says..sanstabhyatmanmatmana...3/43 gita . controlling atma by atmana means mind . This total concept is Hinduism and also the real knowledge , Kshetrajnam chaapi maam viddhi sarvakshetreshu bhaarata;
Kshetrakshetrajnayor jnaanam yattat jnaanam matam mama.
Do thou also know Me as the Knower of the Field in all fields, O Arjuna! Knowledge of
both the Field and the Knower of the Field is considered by Me to be the knowledge. Shabdaadeen vishayaanstyaktwaa...50/18....madbhaktim labhate paraam....53/18
Leaving aside the different complicated wordings , one gets my supreme devotion .
But how ?
Sarvadharmaan parityajya maamekam sharanam vraja;
Aham twaa sarvapaapebhyo mokshayishyaami maa shuchah.
Abandoning all dharmas, believe in Me alone [ vishnu karmani pasyasi…rigveda ]; I will liberate thee from all sins; grieve
uttishtha yasho labhaswa
Jitwaa shatroon bhungkshwa raajyam samriddham;
Mayaivaite nihataah poorvameva
Nimittamaatram bhava savyasaachin.
stand up and obtain fame. Conquer the enemies and enjoy the unrivalled
kingdom. Verily, they have already been slain by Me; be thou a mere instrument, O Arjuna!....33/11 gita . So spirituality mainly contains the devotion which in other words may be called as duty with devotion or avyabhichariny bhakti . Mayi chaananyayogena bhaktiravyabhichaarinee;
Viviktadesha sevitwam aratir janasamsadi.
Unswerving devotion unto Me by the Yoga of non-separation, resort to solitary places,
distaste for the society of men . Maam cha yo’vyabhichaarena bhaktiyogena sevate;
Sa gunaan samateetyaitaan brahmabhooyaaya kalpate.
And he who serves Me with unswerving devotion, he, crossing beyond the qualities, is
fit for becoming Brahman.