You have your money and possessions and life on loan. As a trust. You are the manager of Another's trust fund. We will all be held accountable for managing his money according to his word. I know no stories of people who have given so generously that God did not meet their needs.
Expenses always expand to fill the income.
We won't give because we don' t think we can afford it. The Bible encourages both spontaneity and discipline in giving. I urge you to build this regularity and priority into your giving. Go for it. God will not let you down.