Of course, Augustine did not come up with this concept alone. Actually, Jesus himself spoke about the necessity of strong foundations.
“So why do you keep calling me ‘Lord, Lord!’ when you don’t do what I say? I will show you what it’s like when someone comes to me, listens to my teaching, and then follows it. It is like a person building a house who digs deep and lays the foundation on solid rock. When the floodwaters rise and break against that house, it stands firm because it is well built. But anyone who hears and doesn’t obey is like a person who builds a house without a foundation. When the floods sweep down against that house, it will collapse into a heap of ruins.”
Those who listen to and apply the concepts of Christ’s teaching are like people building homes on solid rock. In this parable, Jesus talks about the necessity of “digging deep” and building a firm foundation; he knew better than any that, if his believers would seek to live a fruitful Christian life even in the face of adversity, they would need to do the dirty work of digging deep and finding a foundation.