Here is a list of phrases, sayings and common expressions starting with I.
If a job is worth doing it is worth doing well
if at first you don't succeed try try and try again
if music be the food of love play on
if wishes were horses beggars would ride
if you can't beat 'em join 'em
if you can't stand the heat get out of the kitchen
imitation is the sincerest form of flattery
in the kingdom of the blind the one-eyed man is king
it's better to give than to receive
it's better to light a candle than curse the darkness
it's better to travel hopefully than to arrive