David Livingstone's Challenge

It has been a delight and exhausting challenge to study "Desiring God" by John Piper. And this week, there was a statement from the study that I think will challenge us for the rest of our careers to serve God in Angola, with great joy. It was made by a "famous" missionary of the 1800s, David Livingstone, who spent much of his time in Africa. Interestingly enough, he said this quote on DECEMBER 4th ... in 1857 (yesterday, 157 years ago):

For my own part, I have never ceased to rejoice that God has appointed me to such an office. People talk of the sacrifice I have made in spending so much of my life in Africa. . . . Is that a sacrifice which brings its own blest reward in healthful activity, the consciousness of doing good, peace of mind, and a bright hope of a glorious destiny hereafter? Away with the word in such a view, and with such a thought! It is emphatically no sacrifice. Say rather it is a privilege. Anxiety, sickness, suffering, or danger, now and then, with a foregoing of the common conveniences and charities of this life, may make us pause, and cause the spirit to waver, and the soul to sink; but let this only be for a moment. All these are nothing when compared with the glory which shall be revealed in and for us. I never made a sacrifice.

How does someone, with no Internet, Skype, ice cream, cell phone, air conditioning, or any modern amenity (no matter how simple ... I mean, not even peanut butter!) say "I never made a sacrifice?"
Truly, his words were founded on God's truth, spoken by none other than Jesus:

Truly, I say to you, there is no one who has left house or brothers or sisters or mother or father or children or lands, for my sake and for the gospel, who will not receive a hundredfold now in this time, houses and brothers and sisters and mothers and children and lands, with persecutions, and in the age to come eternal life. (Mark 10:29-30)