یہ شہا دت گہ الفت میں قدم رکھنا ہے

لوگ آساں سمجھتے ہیں مسلماں ہونا

Transliteration...
Yeh Shadath Gahe Ulfat Main Qadam Rakhna Hai
Log Asaan Samjhte Hain Musalman Hona

Meaning...
If you believe(shahada)then it means you are entering the world of love.
People Think that, it is easy to become a Muslim.

My impression...
When I read this it seems to me that Iqbal translated the the ayah "Al-baqra (213) Or think you that you will enter Paradise without such (trials) as came to those who passed away before you? They were afflicted with severe poverty and ailments and were so shaken that even the Messenger and those who believed along with him said, "When (will come) the Help of Allâh?" Yes! Certainly, the Help of Allâh is near! (214)." in this verse of his poetry.

If you believe(shahada) then it means be ready for the test that will incur in this way of love towards Allah and Prophet(saw).We think that becoming a Muslim is very easy. We think that Islam is just a collection of some rituals(5 time prayer,Fasting,Hajj,Zakath and few other sunnah and farz). Can any one imagine that if you have been given a task to guide the whole mankind and he thinks that just performing some few routine stuffs will suffice the need. This task cannot be achieved unless we fully devote our self to it. If you want the practical example for this verse of Allama Iqbal.Read the history of Musab Bin Umair(raz),Hazrate Bilal(raz),Hazrate Ameere Hamza(raz).Syed Qutub Shaheed,Hasanul Banna Shaheed...

Someone said truly in Love you win only when you loose everything you have...

Now the question is do we Love Allah and His Prophet(PBUH) as we should........?