Believe anyway.

Do you have a promise from God that you're holding on to?

A promise that seems to be impossible to happen? 

Don't worry, don't lose hope. 

I hope that our attitude will be like that of Abraham, he who chose to believe that God will do what He said He will do. 

Romans 4: 18-21 / Against all hope, Abraham in hope believed and so became the father of many nations, just as it had been said to him. 'So shall your offspring be.' Without weakening in his faith, he faced the fact that his body was as good as dead - since he was about a hundred years old - and that Sarah's womb was also dead. Yet he did not waver through unbelief regarding the promise of God, but was strengthened in his faith and gave glory to God, being fully persuaded that God had power to do what he had promised.

Abraham was about a hundred years old when God told him that he will have a son. Scientifically speaking, it is considered impossible to have a son at that old age. I can imagine people laughing at him when he shares what God had told him. Even his wife, Sarah, laughed when she heard about it (Genesis 18:12). The people who were supposed to be Abraham's support system became the very people who gave him discouragements concerning God's promises to him. Imagine how painful it was for Abraham.

Yet despite all these, he didn't lose hope. He chose to put his confidence in God, not on his situation. He knew that his God can do whatever He has promised him. And after some years of waiting, he received God's promise for him. 

Romans 4:16 / 'Therefore, the promise comes by faith, so that it may be by grace...'

Whatever God has promised, consider it done. Have faith in Him for he is God, a faithful and promise-keeping God.