The Bible. Know it in your head. Stow it in your heart. Show it in your life. Sow it in the world.
If you lack wisdom in regard to a problem, you need to go to God in prayer.
As someone has said, we either crucify or crown the Lord Jesus by our lives.
An expert is an ordinary fellow from another town.
If a sinner comes into your assembly or you otherwise come into contact with him, remember that he is a human being for whom Christ died. He stands at the foot of the cross, just as you stand at the foot of the cross.
The great sin of the average Christian is ignorance of the word of God.