Willpower

will (noun)

1 the will to succeed: determination, willpower, strength of character, resolution, resolve, resoluteness, single-mindedness, purposefulness, drive, commitment, dedication, doggedness, tenacity, tenaciousness, staying power.

2 they stayed against their will: desire, wish, preference, inclination, intention, intent, volition.

3 God's will: wish, desire, decision, choice; decree, command.

4 the dead man's will: testament, last will and testament, bequest.