Lightness comes when words are accurate.
Expression: Accurate words means there is nothing extra spoken. Whatever has to be said is said to the point. Such words being short are sweet to hear too and are those that never hurt others. They bring about the result needed accurately.
Experience: When my words are to the point, there is a lot of lightness experienced within me and my physical energy is saved too. Others too experience benefit through my words and so I naturally get blessings from them, which helps me move forward with lightness.