Practical advice given for peace and inner-strength by reminding the listener not to be overly focused on the worldly senses.
Chapter 3 contains much advice for living a worthy life. In verse 6 the listener is given some good guidance on maintaining inner peace.
Anyone who having controlled the five working sense organs remains thinking within the mind about sense objects , that foolish being known as a hypocrite. (www.bhagavad-gita.org)
Ultimately, this means that a person is better of controlling interest in objects related to by the five senses than just pretending to do so while actually thinking about them. It is hypocritical to say you won’t be governed by your senses when you are actually thinking about them.
To have real inner peace you cannot be governed by external senses. You cannot want external objects. To really have inner peace and personal strength, you have to be able to control your urges. This part of the song reminds us of this.