This is actually Steve Jobs' original quote at his Commencement Address of Stanford University in 2007.

It's our passion that makes us crave for constant and never-ending improvement.

Also, it's our ardent love for our work that encourages us to keep doing what we do even if we encounter several challenges.

We don't let setbacks stop us from being successful.

More importantly, if we are to do great things, we must always be motivated to take bold initiatives!