This was a supernatural occurrence as the widow followed the instructions given her by God – to go and get empty containers or jars and start pouring out what she had into them.

Although she objected at first saying ‘I have nothing in the house but a jar of oil’, she followed through. 

If we want to hold onto things for ourselves – that ‘just in case’ type of thinking, then how can there be any opportunity for God to give the increase, as He uses what we have surrendered to Him in faith. He refills, He replenishes… He gives the increase.