This quote by Samuel Butler suggests that death is not something to be feared, but rather a natural part of life. He is suggesting that death is simply a shift from one place to another, similar to going on a journey. He is implying that death is not completion, but rather a new beginning. He is suggesting that death belongs of life, and that it ought to be embraced instead of feared. He is also recommending that death is a natural part of the cycle of life, which it should be accepted as such. By comparing death to travelling, Butler is recommending that death is a journey, and that it ought to be seen as an opportunity to explore brand-new locations and experiences. He is suggesting that death should be viewed as a chance to explore the unidentified, and to experience something new. Eventually, Butler is suggesting that death should be viewed as a part of life, which it needs to be welcomed rather than feared.
"Death is no more than passing from one room into another. But there's a difference for me, you know. Because in that other room I shall be able to see"