Well yeah this cannot be defined in one answer. But there is another famous couplet which sort of defines khudi's application.
Apne mann mai doob k pa ja soragh-e-zindagi
Tu mera nahi banta na ban, apna tu ban
The concept of Iqbal is discussed so much everywhere but never achieved or practiced...
pls kindly can you tell why not best iba sukkur ??????????