What is valued at nothing?

A thing that costs you nothing is valued at nothing. 

Just in proportion to the real love and sacrifice will be the value to your own soul. 

In other words, what you love you work for, sacrifice your time and money for. 

Out of those things—or their inner force is your character built up. 

If you value dress, earthly gain, self-indulgence—or earthly honours, you work and sacrifice for them, and the inner force that creates the desire grows into your character. 

And soon you have either a frivolous—miserly—inordinately selfish—or ambitious character. 

If you desire the fruits of the spirit—

Love—joy—peace—long-suffering—gentleness—patience—humility—

You will exert your every effort for them. 

And the effort thus put forth will grow into character, for only through effort can you ever gain them.

Letters from the Teacher, Teachings of the Order of the 15