Here the word "you" refers to himself. The word "happiness" can be expressed as an adjective. AT: "I will test myself with things that make me happy" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])
This speaks of how happiness only lasts for a short time as if it were a temporary breeze. AT: "this also only lasted for a short time, like a temporary breeze" (See: [[rc://en/ta/man/translate/figs-metaphor]])
The direct quotation can be translated as an indirect quotation. AT: "I said that it is crazy to laugh at things" (See: [[rc://en/ta/man/translate/figs-quotations]])