To Sacrifice A Higher For A Lower?

John Piper in 1977:
 The only reason for living is the achievement of what you value. Nobody should ever sacrifice a higher value to a lower one. You should always aspire to deciding what you value. Until that happens you cannot make any reasonable steps toward choosing a vocation (or anything else). My highest value is to see God glorified. The way God has guided me to realize that value is through ____________ .

Stop. Think. The only reason for living ... Never a higher value for a lower value ... Always aspire ... My highest value ...

Now fill in the blank.