Why should we serve Hashem without expectation of reward?

Serving Hashem without expectation of reward fosters genuine relationships, as it reflects the purity of intention behind our actions. When one engages in service or worship without hoping for a reward, it demonstrates sincerity and devotion. This unselfish approach creates a deeper, more authentic connection with Hashem and underscores the importance of serving out of love, commitment, and faith rather than for personal gain. It encourages individuals to act out of intrinsic motivation, leading to a more meaningful spiritual life.

In contrast, focusing on receiving rewards can lead to a transactional view of faith, which may diminish the depth of the relationship with the divine. Additionally, the other options, while they may contain elements of truth, do not encapsulate the essence of serving Hashem as an expression of love and sincerity that characterizes a genuine relationship.