The canary began to sing again. The sun had struck it, and its throat and tiny breast had filled with son. Francis gazed at it for a long time, not speaking, his eyes dimmed with tears.
"The canary is like our soul. It sees bars around it, but instead of despairing it sings, and see: one day its song shall break the bars."
~ from SAINT FRANCIS by Nikos Kazantzakis
Penetrating deeper and deeper into the nature of reality
As one contemplates, penetrating deeper and deeper into the nature of reality, one leaves the sensible world behind, transcends the subject/object mode of perception, and experiences one's soul.