All warrantee/guarantee clauses become void on payment of the final invoice - Murphy's law.

Wise man has long ears, big eyes and a short tongue - Russian proverb.

Call no man happy before his death - Solon.

Life is suffering - Lord Buddha.

What is observed depends on who is looking - WH George.

To learn is to change and to change is to learn. You cannot change without learning.

You can learn best by doing.