Challenging experiences are the most educational and so, ultimately, beneficial.

Something is not affected in the same way twice.

(idiomatic) Most things are inherited and predetermined.

Do not seek advice from a biased party.

Alternative form of the apple does not fall far from the tree

(obsolete, dialect) The houseleek.

There will always be problems in a romantic relationship.

One cannot change one's nature, no matter how much time passes.

When you notice that an enemy is making an error, take care not to interfere with the enemy from completing it so you can take advantage at the right time.

People tend to take things for granted that are easily available.