DEUT1431 Do not muzzle an animal during its labors. Key concept: To instill in ourselves noble character traits, such as kindness and sympathy. This mitzvah is meant to incline one's heart towards the good, so that we pursue it and never swerve from it. By accustoming ourselves to human treatment of beings that were created only to serve us, we will custom ourselves to benevolent behavior towards our fellows in every way possible. Such is fitting for the Chosen People.