Letters!!

The most selfish 1 letter word: I. Avoid
it.
The most satisfying 2 letter word: We.
Use it.
The most poisonous 3 letter word: Ego.
Kill it. The most used 4 letter word: Love.
Value it.
The most pleasing 5 letter word: Smile.
Keep it.
The fastest spreading 6 letter word:
Rumor. Ignore it. The hardest working 7 letter word:
Success. Achieve it.
The most enviable 8 letter word:
Jealousy. Distance it.
The most powerful 9 letter word:
Knowledge. Acquire it. The most essential 10 letter word:
Confidence. Trust it.