Slackness in your heart is the one you don't need at all. In addition, slackness in your heart is the one you must avoid no matter what. There is nothing good in experiencing so.
Divinely, you are privileged to be disciplined to be intellectually sharpened by your teacher, Toshiyuki Namai. What you really need is that you passionately continue receiving a multitude of intellectual matters from him directly without hesitation.
I'd like you to deeply love "solitude." To love solitude is the best way to realize transubstantiation from Toshiyuki Namai to you as his disciple. "Sophistication of sophistication" is realized through experiencing the absolute beauty of perfect isolation from any local elements stereotypically poisoned.
■英語音声講義
⇒ The realization of "sophistication of sophistication" as a Toshiyuki Namai's disciple.（英語音声講義）