I have lived in this realm for 22 years and God has never failed me yet. When you give, God will always yield a harvest. As long as the earth remains, there will be seedtime and harvest. 
 
Malachi 3:10-11 - Bring ye all the tithes into the storehouse, that there may be meat in mine house, and prove me now herewith, saith the Lord of hosts, if I will not open you the windows of heaven, and pour you out a blessing, that there shall not be room enough to receive it.