No crime is too difficult for him. 176 of the Dhammapada would constantly remind you of this. Ekam dhammam atitassa musavadissa jantuno Vitinnaparalokassa natthi papam adariyam . Dishonesty in speech leads to a total breakdown of all social contracts. Human society has to go on a basis of trust and understanding.
Promises have to be kept.
Wheels of society move on this basis. We are wheels within wheels. If one fails, the entire set up can come to a grinding halt. Let us take a few statements from the dhamma and examine them ourselves. He who abstains from lying speaks only what is true.