The strength of every building depends on its foundation. Casting foundation on a plain land is not a joke , not talking of casting foundation on solid rock. Is not a mouth say, it takes great strength, devotions, determination and perseverance to do this.
Foundation in this context is not for a real structure but for human beliefs, practice and faith. There are many different kinds of subtle energy on this earth. There are many gods that demands worship.
We have ancestors, gods, spirits, demons, angels, Demi-Gods, and the God himself. Out of ignorance and material desires, many people worship ancestors. Some people wants fame and riches so they worship demons. Others wants powers and spiritual authorities so they worship Demi-Gods and angels.
Whom do you worship? Where is your faith? Who have power over all creations? Whom deserves to be worship?
Knowing this will let you know the kind of foundation you are building. Is it on solid rock? Does it have salvation? Build your house on a surviving land; where it can stand in all storms and difficulties.
May your creator light up your ways so darkness may not blind you to worship out of ignorance. Amen