楽あれば苦あり　　　No pleasure without pain.

良薬は口に苦し　　　Bitter pills may have blessed effects.

類は友を呼ぶ　　　Birds of a feather flock together.

歴史は繰り返す　　　History repeats itself.

ローマは一日にして成らず　　　Rome was not built in a day.

六十の手習い　　　It is never too late to learn.

論語読みの論語知らず　　　Astrology is true but the astrologers cannot find it.

論より証拠　　　All the proof of the pudding is in the eating.
Example is better than precept.