Kierkegaard's ideas bring some tough questions for existentialist philosophy. Here’s what he emphasizes:

1. Subjectivity: He focuses on personal experiences. This makes it hard to find truths that everyone can agree on.

2. Faith vs. Reason: There is a struggle between belief and logic. This raises concerns about how much we can rely on human choices in existentialism.

3. Despair: Kierkegaard talks a lot about despair, which means feeling really troubled inside. He suggests that dealing with these deep feelings is not easy.

Possible Solutions:

• We can try to combine faith and reason. It’s important to see that we need both when dealing with life’s tough questions.