Example is always more efficacious than precept.
The authority of science … promotes and encourages the activity of observing, comparing, measuring and ordering the physical characteristics of human bodies.… Cartesian epistemology and classical ideals produced forms of rationality, scientificity and objectivity that, though efficacious in the quest for truth and knowledge, prohibited the intelligibility and legitimacy of black equality…. In fact, to "think" such an idea was to be deemed irrational, barbaric or mad.cornel west
Teaching at best beckons us to morality, but it is not in itself efficacious. Teaching is like a mirror. It can show you if your face is dirty, but it the mirror will not wash your face.ravi zacharias
The endeavor of scientific research to see events in their more general connection in order to determine their laws, is a legitimate and useful occupation. Any protest against such efforts, in the name of freefom from restrictive conditions, would be fruitless if science did not naïvely identify the abstractions called rules and laws with the actually efficacious forces, and confuse the probability that B will follow A with the actual effort make B follow A.max horkheimer
The more you study the lessons as the word of God speaking to you by the Holy Ghost, and the more you come to believe in direct answers to prayer, the more efficacious will be your teaching by word and example upon the hearts and lives of others.