U & me

How can you "SM_LE" Without "I" ?
How can you be "F_NE" without  "I" ?
How can you "W_SH" Without  "I" ?
How can you be "FR_END" without  "I" ?
 "I"  am very important!
But this  "I"  can never achieve S_CCESS with "U" 
 and that makes"you" more important than "I