Conquering any difficulty always gives one a secret joy, for it means pushing back a boundary-line and adding to one's liberty. 
I get curious about new things. My real strength is going into a field that has not been investigated before, and finding new approaches to it.
The harder the struggle, the more glorious the triumph. Self-realization demands very great struggle.
The real spiritual progress of the aspirant is measured by the extent to which he achieves inner tranquility.