John 7:17 If anyone’s will is to do God’s will, he will know whether the teaching is from God or whether I am speaking on my own authority.
The difficulty of finding out “what is truth” in religion is a common subject of complaint among men. They point to the many differences which prevail among Christians on matters of doctrine, and profess to be unable to decide who is right. In thousands of cases this professed inability to find out truth becomes an excuse for living without any religion at all.
The saying of our Lord before us is one that demands the serious attention of people in this state of mind. It supplies an argument whose edge and point they will find it hard to evade. It teaches that one secret of getting the key of knowledge is to practice honestly what we know, and that if we conscientiously use the light that we now have, we shall soon find more light coming down into our minds. In short, there is a sense in which it is true, that by doing we shall come to knowing.