A single text often gave him all the help he needed: 

“It is singular,” he says, “that the very same text which recurred to my mind at every turn of my course in life in this country and even in England, should be the same as Captain Maclure, the discoverer of the Northwest Passage, mentions in a letter to his sister as familiar in his experience:  ’Trust in the Lord with all thine heart, and lean not to thine own understanding.  In all thy ways acknowledge Him and He shall direct thy steps.  Commit thy way unto thy Lord; trust also in Him and He shall bring it to pass.’  Many more, I have no doubt, of our gallant seamen feel that it is graceful to acknowledge the gracious Lord in whom we live and move and have our being.  It is an advance surely in humanity from that devilry which gloried in fearing neither God, nor man, nor Devil, and made our wooden walls floating hells.”

His being enabled to reach the sanctuary of perfect peace in the presence of his enemies was all the more striking if we consider—­what he felt keenly—­that to live among the heathen is in itself very far from favorable to the vigor or the prosperity of the spiritual life.  “Traveling from day to day among barbarians,” he says in his Journal, “exerts a most benumbing effect on the religious feelings of the soul.”

Among the subjects that occupied a large share of his thoughts in these long and laborious journeys, two appear to have been especially prominent:  first, the configuration of the country; and second, the best way of conducting missions, and bringing the people of Africa to Christ.

The configuration of intertropical South Africa had long been with him a subject of earnest study, and now he had come clearly to the conclusion that the middle part was a table-land, depressed, however, in the centre, and flanked by longitudinal ridges on the east and west; that originally the depressed centre had contained a vast accumulation of water, which had found ways of escape through fissures in the encircling fringe of mountains, the result of volcanic action or of earthquakes.  The Victoria Falls presented the most remarkable of these fissures, and thus served to verify and complete his theory.  The great lakes in the great heart of South Africa were the remains of the earlier accumulation before the fissures were formed.  Lake ’Ngami, large though it was, was but a little fraction of the vast lake that had once spread itself over the south.  This view of the structure of South Africa he now found, from a communication which reached him at Linyanti, had been anticipated by Sir Roderick Murchison, who in 1852 had propounded it to the Geographical Society.  Livingstone was only amused at thus losing the credit of his discovery; he contented himself with a playful remark on his being “cut out” by Sir Roderick.  But the coincidence of views was very remarkable, and it lay at the foundation of that brotherlike intimacy