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But if it had to perish twice,
I think I know enough of hate
To say that for destruction ice
Is also great
And would suffice.
In lines five to nine, the speaker reasons out how "ice" could also be a potentially destructive element. To summarise, the speaker states that 'ice would be great and sufficient to destroy a world if it had to be destroyed twice'.
Life can be built or sustained only in moderate climates. We had seen previously how life on Mercury wasn't possible because of the heat. Similarly, life on colder planets is extremely unlikely. But we don’t have to go out into the space to demonstrate that; we are aware of how winter doesn't support life as much as the other seasons do.
Speaking of how ice could be destructive, it is to be noted that it stands second to “fire”. The speaker is certain that it is the fire that is going to destroy the world. Yes, ice can be harmful but the speaker feels that it may not be as malignant as fire.
Let us think of two scenarios:
  1. Being trapped in a room that caught fire
  2. Being trapped in a walk-in refrigerator
Between the two scenarios, the survival rate is better in the second. Fire will spread faster and can kill you instantly. Since ice gives you a slower death, you might be able to find time to save yourselves.
History has showed us how destructive ice can become. Studies show us that during the last ice age,“roughly about 35 different types of large mammals went extinct”, although there is no evidence that proves that it was the ice that destroyed the species. But what is evident is the fact that the homo sapiens (early human) and several other live forms survived and evolved. Hence, ice might have destroyed some of the species, but it certainly couldn’t destroy the world.
Nevertheless, the speaker is not addressing ice in its literal sense. As seen previously with fire, ice also is used as a metaphor in the poem. The line “I think I know enough of hate” reveals that ice embodies the negative emotion of hate. 
Meanings of difficult words:
PerishTo die, especially in a violent or sudden way
SufficeBe enough or adequate
SaveKeep safe or rescue (someone or something) from harm or danger
RuedBitterly regret (something one has done or allowed to happen) and wish it undone
National Council of Educational Research and Training (2007). First Flight. Fire and Ice-Robert Frost (pp. 15). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.