31) Hope for the best,
but prepare for the worst.

32) Repentance is good,
but innocence is better.

33) Short is my date,
but deathless my renown.

34) The peacock has fair feathers,
but foul feet.

35) Sickness is felt,
but health not at all.

36) Mother’s darlings are
but milksop heroes.

37) None
but the wearer knows where the shoe pinches.

38) Patience is bitter,[sentencedict.com]
but its fruit is sweet.
Aristotle 
39) Many are called
but few are chosen.

40) Read not books alone,
but men.

41) Nothing must be done hastily
but killing of fleas.

42) Eat to please thyself,
but dress to please others.

43) Men may meet
but mountains never.

44) The fox may grow grey,
but never good.

45) Give every man thy ear,
but few thy voice.

46) The day is short
but the work is much.

47) There is no man
but has his faults.

48) Beauty is potent,
but money is more potent.

49) Friends may meet,
but mountains never greet.

50) We learn not at school,
but in life.

51) Many a good father hath
but a bad son.

52) No man learns
but by pain or shame.

53) A man can die
but once.

54) Charity begins at home,
but should not end there.

55) Beauty is potent;
but money is omnipotent.

56) A man can be destroyed
but not defeated.

57) Love sought is good,
but give unsought is better.

58) I will be thy friend,
but not thy vice’s friend.

59) I am not only witty in myself,
but the cause that wit is in other men.

60) It is the nature of every man to err,
but only the fool perseveres in the error.

31) Zoff was originally dismissed as a crank, but his theories later became very influential.
32) We lost two or three early games in the World Cup, but we bounced back.
33) I've received a gift from him, but I'm not going to accept it.
34) They sell a few pot plants, but they mainly sell cut flowers.
35) I'd have liked to have gone but I wasn't invited.
36) There have been major changes in the constitution, but the system remains democratic.
37) The government recognised there were problems in urban areas but these could never be an excuse for lawless behaviour.
38) I'm not prudish but I think these photographs are obscene.
39) The device was thrown at an army patrol but failed to explode.
40) He has made a good recovery but still tires easily.
41) You can come early if you want to, but there's no necessity for it.
42) His face was expressionless, but Alex felt the unspoken criticism.
43) I don't agree with her, but I admire her for sticking to her principles.
44) He tried to push the door open, but he didn't have sufficient leverage.
45) They battled against other Indian tribes, but rarely fought with the whites.
46) I heaved with all my might but still couldn't budge it.
47) The house was a school for a while, but has reverted to being a private house.
48) I was going to ask if his dog was any better, but I didn't dare in case it had died.
49) The ringleader of the gang had one hand loose but the other was tied to another robber's.
50) He seemed quite nervous at the beginning of the meeting, but he soon loosened up.
51) The play has a very strong cast, but two actors in particular shine out.
52) Originally the builders gave me a price of £2000, but now they say they underestimated and it's going to be at least £3000.
53) They tried to get into the club but were refused admission.
54) But it's an ill wind; I recovered and married one of my nurses from that hospital.
55)