"A wrong concept misleads the understanding; a wrong deed degrades the whole man, and may eventually demolish the structure of the human ego"

This quote by Muhammed Iqbal speaks to the power of our thoughts and actions. He is suggesting that our understanding of the world is shaped by our concepts and beliefs, and if these are incorrect, then our understanding will be misdirected. Furthermore, he is saying that our deeds have a profound impact on our character and sense of self. If we act in a manner that is incorrect, it can have an unfavorable influence on our sense of self-respect and our identity. Ultimately, this can result in the damage of our sense of self and our ego.

Iqbal is emphasizing the importance of having a strong ethical compass and making certain that our thoughts and actions are in line with our values. He is suggesting that if we make incorrect decisions, it can have an enduring and harmful result on our sense of self. Therefore, it is important to be mindful of our ideas and actions and to make every effort to make choices that are in line with our worths.