You can judge the quality of their faith from the way they behave. Discipline is an index to doctrine. Tertullian
The happiness of your life depends upon the quality of your thoughts: therefore, guard accordingly, and take care that you entertain no notions unsuitable to virtue and reasonable nature. Marcus Aurelius
If we truly think of Christ as our source of holiness, we shall refrain from anything wicked or impure in thought or act and thus show ourselves to be worthy bearers of his name. For the quality of holiness is shown not by what we say but by what we do in life. Gregory of Nyssa
The quality of decision is like the well-timed swoop of a falcon which enables it to strike and destroy its victim. Sun Tzu
A country can be judged by the quality of its proverbs. German Proverb
It's hard to know the quality of a person, or a watermelon. Japanese Proverb