Determination (Buddha)

Only determination can completely fulfill the other mental perfections!

Its characteristic is an unwavering decision, its function is to overcome
hesitation, and its manifestation is unfaltering persistence in this task...!
The proximate cause of determination is strong willpower to succeed!
Only the power of resolute determination lifts any praxis to perfection...

When the Future Buddha placed his back against the trunk of The Bodhi
Tree, he right there made this mighty decision: 

"Let just the blood and flesh of this body dry up and let the skin & sinews
fall from the bones. I will not leave this seat before having attained that
absolutely supreme Enlightenment!" So determined did he invincibly seat
himself, from which not even 100 earthquakes could make him waver. 

Whose mind is like a rock, determined, unwavering, immovable,

without a trace of lust of urging towards all the attractions,

without a trace of aversion of pushing away all the repulsive,

from what, can such a refined mind ever suffer?

Source: http://what-buddha-said.net/drops/Determination_Determines.htm