useless trivia: What Word Means: To Caterwaul?

Questions

"------------ comes not from always being right but from not fearing to be wrong."- Peter T. McIntyre?

"Years may wrinkle the skin. Lack of ---------- will wrinkle the soul."- Anonymous?

"----------- is gone. Tomorrow has not yet come. We have only today. Let us begin."- Mother Teresa?

"------------- is not ours to recover, but tomorrow is ours to win or lose."- Lyndon B. Johnson?

"'He means well' is ----------- unless he does well."- Plautus?