This world is not our true home, and we are not the body nor the mind, not the intellect nor the senses. Our true essence is spirit or soul.
kaumāraṁ yauvanaṁ jarā
tathā dehāntara-prāptir
dhīras tatra na muhyati
BG 2.13
The soul is a part of God that migrated away from God aeons ago and yearning to return to its Source.
jīva-bhūtaḥ sanātanaḥ
manaḥ-ṣaṣṭhānīndriyāṇi
prakṛti-sthāni karṣati
BG 15.7
This human existence is the opportunity for our soul to find its way back - its a brief sojourn in our soul's long voyage back to its Source. The journey to return home is the journey of the spirit, or what is known as the spiritual journey.
Embarking on the inner spiritual journey, we experience ourselves in our true form and awaken to the reality of life.
However, we take this physical world to be our home and take our body - a vehicle made of matter to be our true identity, not realising that we are, in reality, spirit, the power that enlivens the body.
In the Bhagavad Gita, Krishna proclaims, mama vartmānuvartante manuṣhyāḥ pārtha sarvaśhaḥ - everyone follows My path, knowingly or unknowingly.
Being equanimous, and absolutely unaffected by the happenings in our lives takes us closer to bliss, and it requires sadhana. For success in this endeavour, we must make a sincere and earnest effort, and chant regularly and diligently, so that we can take steady steps God-ward.
śravaṇādi-śuddha-citte karaye udaya
---Chaitanya charitamrta
Its our responsibility to seize the breaths we have been given so that our soul can cross the great ocean of life, realise his relationship with God and reach the abode of God.