6 ideas
Fortune's essence is change, so complaining when she turns against you is complaining that she is being herself. Whoever accepts her gifts has already agreed to her terms, including the day she takes them back. A Fortune that stayed constant would stop being Fortune.
Good fortune deceives by looking stable and making people think they are happy. Bad fortune tells the truth by showing that these goods can be lost. It also teaches you who your real friends are, because reversal removes the people who were only attached to your prosperity.
Wealth, office, power, fame and pleasure each pursue one part of true happiness: self-sufficiency, respect, strength, renown or joy. Chased separately, each one undermines itself. Wealth creates new needs to be guarded against, and office brings respect only as long as the office lasts. Real happiness is the one good in which all five coincide, and that good is God.
Every person naturally wills the good, so the wicked, who fail to reach it, actually lack power, however dominant they appear. Evil reduces the one who does it below the human toward the bestial, so wickedness is its own punishment. Getting away unpunished is a worse fate than being justly punished.
Providence is the single divine plan seen all at once. Fate is that same plan unrolled through time across changing things. Like concentric circles turning around a still center, the closer a mind draws to God, the less it is bound by fate's moving chain.
A thing is known according to the capacity of the knower, not the nature of the thing known. God's mode is eternity, the whole of limitless life held at once, so God sees our future choices as present rather than foreseeing them. Seeing an act does not make it necessary, so free will survives divine knowledge.