求一句If结构的英文谚语

If God had meant us to fly he'd have given us wings
If a job is worth doing it is worth doing well
If at first you don't succeed try, try and try again
If ifs and ands were pots and pans there'd be no work for tinkers
If life deals you lemons, make lemonade
If the mountain won't come to Mohammed, Mohammed must go to the mountain
If wishes were horses beggars would ride
If you can't be good, be careful.
If you can't beat em, join em
If you can't stand the heat get out of the kitchen