Sri Sri Ravi Shankar: Wake up and see that nothing is yours; nothing that you have belongs to you, then you become totally surrendered (Saranagati).
Or, see all that you have received, even when you were not deserving of it then also you become totally surrendered (Saranagati).
Thinking that, ‘I did not deserve so much, yet I have received so much’, makes you totally surrendered, and gratefulness automatically wells up in you.