Flattery is from the teeth out. Sincere appreciation is from the heart out.
Your smile is a messenger of your goodwill.
Ask questions instead of giving direct orders.
To be interesting, be interested.
An old man was asked what had robbed him of joy in his life. His reply was, "Things that never happened."
Praise is like sunlight to the warm human spirit; we cannot flower and grow without it. And yet, while most of us are only too ready to apply to others the cold wind of criticism, we are somehow reluctant to give our fellow the warm sunshine of praise.