Be anxiously engaged

Abraham Lincoln's law partner William Herndon said

Satan selects his disciples when they are idle; Jesus selected his when they were busy at their work

One of the things that this tells me is that we should not sit around waiting for God to tell us what to do or where to serve. He is probably happy to have us serve anywhere we are willing, so we should just get going. If He wants to redirect our efforts then He will do that.

It also is a good reminder that it is easier to stay on the covenant path and avoid temptations if we are not idle. This does not mean we need to always be working at a job, but we should be working on something generally positive, helpful, or meaningful.

26 For behold, it is not meet that I should command in all things; for he that is compelled in all things, the same is a slothful and not a wise servant; wherefore he receiveth no reward.
27 Verily I say, men should be anxiously engaged in a good cause, and do many things of their own free will, and bring to pass much righteousness;
28 For the power is in them, wherein they are agents unto themselves. And inasmuch as men do good they shall in nowise lose their reward.
D&C 58:26-28

What does it mean to be an "agent"? It means we are free to make our own choices. We are not at the mercy of anyone or anything that will force us one way or another. It is up to us to make the best use of our time.

14 [God] hath created all things, both the heavens and the earth, and all things that in them are, both things to act and things to be acted upon. ...
16 [And] the Lord God gave unto man that he should act for himself. ...
26 ... And because that [men] are redeemed from the fall they have become free forever … to act for themselves and not to be acted upon
2 Nephi 2:14, 16, 26

Source: Quoted by James E. Faust