He should think about the breadth of his love and fear of the Creator, which corresponds to the width of the ark. And he should contemplate the tremendous pleasure that the Creator bestows upon the world, which corresponds to the length of the ark. Rav Levi Yitzchok is telling us that every word is very important, and should be carefully considered before it is spoken. Before you speak, think about what you are about to say. Let's examine the facts together and see if this is really so.
Sweet words are like sugar on the lips and soothing to the soul.
People will always be anxious to hear what you have to say. Because of this terrible corruption, all living creatures, even animals had to die. They had no free will to decide to do right or wrong. The Beis HaLevi relates that the sins of man were so powerful, that they even influenced the animals. Once the animals behavior changed, the atmosphere of immorality became so strong that it could not be changed.