Your first thought in the morning.
The kingdom of heaven.
The righteousness of Christ.
The Word of God.
Your soul's salvation.
The salvation of others.
The service of God.
What do these have in common?
Everything else is to be of secondary importance to them.
Worldly labor, self-interest, other books... everything.
*References: CG, page 519. CSW, page 53. RH, November 18, 1884. ST, May 1, 1884. CCh, page 41. 3MR No. 168.