Final answer:
The phrase 'therefore love moderately' suggests that intense love may not endure; moderation ensures that it can last longer and be more fulfilling.
Step-by-step explanation:
The phrase "therefore love moderately" comes from Shakespeare's wisdom that intense passions can lead to equally intense fallout. The blank in your question should be filled with the phrase "so speeds", a metaphor suggesting that fast-paced, overwhelming love does not last. Literature throughout history echoes this sentiment, advising against rushing into deep emotional commitments without temperance and advising to savor love's experiences over time.