Pure Things
A little bit of a pure thing is much better than huge volumes of impure, adulterated things.
Untruthfulness
There is nothing more sinful than untruthfulness. Due to this, Mother Earth once said, "I can bear any heavy thing except the wight of a person who is a liar".
Desire
The desire to gratify one's own senses is kama (lust), but the desire to please the senses of Lord Krishna is prema(love).
Ideal teacher
Lord Chaitanya said that a teacher should behave properly before he begins teaching. One who teaches in that way is called Acharya, or the ideal teacher. Therefore, a teacher must follow the principles of Shastra (Scripture) to teach the common man. The teacher cannot manufacture rules against the principles of revealed scriptures.