It not only means reliability in your word, but also carefulness, accuracy, honesty in your work.

It does not mean that if only you will not lie with your lips you may lie and defraud in the quality of your work.

Honesty means wholeness, completeness; it means truth in everything--in deed and in word.
Merely not to steal another's money or goods is not all there is to honesty.

You must not steal another's time, you must not steal his goods or ruin his property by half finishing or botching your work, by blundering through carelessness or indifference.

Your contract with your employer means that you will give him your best, and not your second-best.
"What a fool you are," said one workman to another, "to take so much pains with that job, when you don't get much pay for it.