"But" brings lot of Weightage to a Sentence! See This.

All good things come to those who wait.
BUT... Time and tide wait for no man.

The pen is mightier than the sword.
BUT... Actions speak louder than words.

Wise men think alike.
BUT... Fools seldom differ.

The best things in life are free.
BUT... There's no such thing as a free lunch .

Slow and steady wins the race.
BUT... Time waits for no man .

Look before you leap.
BUT... Strike while the iron is hot

Do it well, or not at all.
BUT... Half a loaf is better than none.

Birds of a feather flock together.
BUT... Opposites attract.

Don't cross your bridges before you come to them.
BUT... Forewarned is forearmed.

Doubt is the beginning of wisdom.
BUT... Faith will move mountains.

Great starts make great finishes.
BUT... It ain't over 'till it's over.

Practice makes perfect.
BUT... All work and no play makes Jack a dull boy.

Silence is golden.
BUT... The squeaky wheel gets the grease.

You're never too old to learn.
BUT... You can't teach an old dog new tricks

Absence makes the heart grow fonder.
BUT... Out of sight, out of mind.