- The heart has its reasons, which reason knows nothing of.
I think this is meant to suggest that the heart has a higher order of reasoning than the mind. But there is only one kind of true reasoning. Reason knows nothing of the heart's reasons because the so-called reasons of the heart are mere emotional feelings.
- Contentment is the highest virtue.
This is similar to "Man is freest when he is most unconscious of freedom."
So don't strive for freedom or Truth. Be content with what Nature has given you. Don't imagine that you are ignorant or that you do harm to others through your ignorance. Don't imagine that others are more wise than yourself. It will only make you discontent, and your unhappiness will spread to others. If you create "wisdom" then you will also create "ignorance" - and the cause of your own suffering!
Don't think at all! If you refrain from thinking then nothing can bother you.
Only fools imagine they are deluded and that their delusions must be abandoned. Don't these people realize that no matter how deluded you are, you only have to stop reasoning to be happy. After all, is it not said that Enlightenment is happiness? - so happiness must be Enlightenment.