Letting go

In yoga you make conscientious efforts towards your goals while, simultaneously, allowing for non-attachment and ease with the resultant outcomes of your pursuits.

These are the two of the core principles on which yoga rests:

Practice (abhyasa) and non-attachment (vairagya) 
They work together: With an attitude of persistent effort practice leads you in the right direction, while non-attachment allows you to continue the journey without getting sidetracked  - you learn to let go of the many attachments, aversions and fears that cloud the practice...a nice philosophy to carry into everyday life no?