Growing up I heard the phrase "Living from hand to mouth." I'm sure you know that it means.....
Well if you didn't already know, it refers to people living in poverty of sorts. In these days, we'd say someone is "living from pay-check to pay-check" ("check" is also correctly spelt as "cheque").
Now that's what obtains in the world however, the Lord expects us to live from "heart to mouth."
To successfully live from "heart to mouth," we must know and monitor what gets into our heart.
In other words, we must "keep
and guard our hearts with all vigilance
and above all that we guard, for out of it flow the springs of life."*