Narrated Abu Sa'id: The Prophet ﷺ said: There is a tree in Paradise (so huge) that a fast (or a trained) rider may travel: for one hundred years without being able to cross it.
The message behind this hadith is clear; we should never lose hope in Allah's mercy and strive our best to do good deeds so we can be rewarded with entry into His paradise. We should also remember that no matter how hard we try or how much effort we put into something, only Allah knows what will happen in the end; He alone has control over all things.