A thought, experience and direct calling of the heart.
Humanity nowadays is quite disconnected from its sensations, inner world, and the true nature of reality. This is mostly experienced as a deep unfulfilled longing which feeds greed, consumerism and separation. Many spiritual traditions talk about this as the core suffering of humanity. The gap between our soul and human experience can never be incommensurably satisfied from outer stimuli. The only cure for this, is to go inwards, to re-connect with the soul and senses and use this as a bridge to fulfillment.
One way to reconnect is through nature...