Tikvah

ויש תקוה לאחריתך, נאם ה', ושבו בנים לגבולם

And there is hope for your end, says Hashem, and the children will return to their borders.

In Kol HaTor, a question is asked. How can we say that in our end there will only be hope? What kind of consolation is that? But rather, it is explained that the word תקוה (Tikvah), is a code:

ת + ק = 500

So when we reach 500 in ו and 500 in ה, (the letters are pointers to other Kabbalistic ideas) then the children will return to their borders.

The ו and ה need to have 500 each, which is completed from above after we reach 499.5 on our own.