Christ illustrated character building by a house built on a rock, against which storm and tempest were powerless, and the house built on the sand, which was swept away. We are living in perilous times. Amidst the changing scenes, with heresy and false doctrines coming in that will test the faith of all, the house built on the solid rock cannot be shaken. But when storm and tempest come, the house built on the sand will fall, and great will be the fall of it. MM 87.1
Let us take heed, then, how we build. Let no one build unwisely. The word of God is our only foundation. Every semblance of error will come upon us. Some of these errors will be very specious and attractive, but if received, they would remove the pillars of the foundation that Christ has established and set up a structure of man's building. There are those who seeing, see not, and hearing, hear not, and under Satan's guidance they prepare false foundations for human minds. MM 87.2
Christ's lessons should be studied by everyone. The truth is solid, substantial. This truth is to be presented to all; for Satan will come in with his pleasing sentiments, which make nothingness of God's word and turn aside minds from the truth to fables.—Letter 223, 1905. MM 87.3