The most selfish ONE letter word
"I"
Avoid it.

The most satisfying TWO letter word
"WE"
Use it.

The most poisonous THREE letter word
"EGO"
Kill it.

The most used FOUR letter word
"LOVE"
Value it.

The most pleasing FIVE letter word
"SMILE"
Keep it.

The fastest spreading SIX letter word
"RUMOUR"
Ignore it.

The hardest working SEVEN letter word
"SUCCESS"
Achieve it.

The most enviable EIGHT letter word
"JEALOUSY"
Distance it.

The most powerful NINE letter word
"KNOWLEDGE"
Acquire it.

The most essential TEN letter word
"CONFIDENCE"
Trust it.