Teacher already knows. Even if tell a lie, he would know, too. So it’s better l tell the truth. Because in this life, in this world, anyone who has some wisdom and their heart is pure, and they always tell truth, and they are honest, even all the heavenly kings have to respect that person. But if you have wisdom but you are not honest and straight, then it’s bad. It’s better to be just a normal person but being honest and good, than to be monk, a teacher of others , of lay people, but being dishonest and untruthful. It’s better even though, I’m not able to save someone else, at least I can save myself. I cannot tell a lie.