think to glorify god

... if you call out for insight
and raise your voice for understanding,
if you seek it like silver
and search for it as for hidden treasures, 

then you will understand the fear of the Lord
and find the knowledge of God.
For the Lord gives wisdom;
from his mouth come knowledge and understanding;
he stores up sound wisdom for the upright;
he is a shield to those who walk in integrity,
guarding the paths of justice
and watching over the way of his saints.
Then you will understand righteousness and justice 

and equity, every good path;
for wisdom will come into your heart,
and knowledge will be pleasant to your soul;
discretion will watch over you,
understanding will guard you ... Pro 2.3-11

Thinking is one of the important ways that we put the fuel of knowledge on the fires of worship and service to the world. 

The ultimate goal of life is that God be displayed as glorious because of all that he is and all that he has made and done—especially the grace he has shown in the work of Christ. The way we glorify him is by knowing him truly, by treasuring him above all things, and by living in a way that shows he is our supreme treasure.

It is my eager expectation and hope that ... Christ will be honored in my body, whether by life or by death. For to me to live is Christ, and to die is gain. ... To depart and be with Christ ... is far better ... I count everything as loss because of the surpassing worth of knowing Christ Jesus my Lord. (Phil. 1:20–21, 23; 3:8)

Therefore, the main reason God has given us minds is that we might seek out and find all the reasons that exist for treasuring him in all things and above all things.

From John Piper's Think