It is often used to convey the idea that:
* God provides for all creatures, even those that seem insignificant or unpleasant.
* We should trust in God's providence, even when we feel uncertain or worried.
* We should be compassionate and caring towards all beings, even those we may find difficult to love.
The phrase is based on the passage in the Bible, Luke 12:24: "Consider the ravens: they neither sow nor reap, they have no storehouse or barn; yet God feeds them. Are you not of more value than they?"