【正确答案】You Never Know What You Can Do Until You Try
I like the saying that "You never know what you can do until you try." which indicates that as long as you try, any difficulty can be got rid of successfully.
There is always something in this world that we think is difficult. But don't give up at first. Nobody knows what will happen if you do something. The only thing we know is that, if we do nothing, nothing will happen. So just try your best, no matter it will succeed or not, and perhaps there comes a wonder.
Just as you never know how deep the water is before you jump into the river, or you never know the liquid is sweet or bitter before you dip your finger into it and taste, nothing can be correctly perceived or learned until you actually give it a try. Meanwhile, always keep in mind that your ability is unlimited, which could be maximised if you give it to full play. What you have to do is step out, believe in yourself, and you never know what you can do until you try. That's the secret of success.