1 John 3:3

Everyone who has this hope in him purifies himself, just as he is pure.

(v3, NIV)

Those who hope in him purify themselves. He is pure, and the ones who put their hope in also purify themselves. What is this hope? John was just talking about how we are children of God. He doesn't mean everyone is a child of God, but to those who abide in him. In addition, when he appears, we shall be like him and see him as he is. The hope is not in one specific aspect in particular. Rather, it is simply hope in him. Do you place your hope in him? I had to look up the definition of hope.

A wish or desire accompanied by confident expectation of its fulfillment.

(Hope, thefreedictionary.com)

However, hope is referred to as a verb in the ESV.

And everyone who thus hopes in him purifies himself as he is pure.

(v3, NIV)

So, the definition of hope as a verb is:

To wish for something with expectation of its fulfillment.

(Hope, thefreedictionary.com)

It's pretty much the same. I didn't really need to add that. Regardless, do you wish for him with expectation of his fulfillment? Jesus said a lot of different things. Many have come to pass and some still are to come. Do you place your trust in him? Or, are you more hopeful in other things (XBox?). Place your trust in him. Those who do that purify themselves as he is pure.