Definition of Logos
Glorfindel, a mighty and legendary elf who comes to the aid of Frodo's party when they are pursued by ring-wraiths, uses logos in his argument that Frodo must ride on without his companions towards Rivendell:
"You shall ride my horse," said Glorfindel [...] "he will bear you away with a speed that even the black steeds of the enemy cannot rival."
"No, he will not!" said Frodo. "I shall not ride him, if I am to be carried off to Rivendell or anywhere else, leaving my friends behind in danger."
Glorfindel smiled. "I doubt very much," he said, "if your friends would be in danger if you were not with them! The pursuit would follow you and leave us in peace, I think. It is you, Frodo, and that which you bear that brings us all in peril."
Saruman, a powerful wizard and peer of Gandalf, uses logos in his argument to Gandalf that they should attempt to harness, rather than destroy, the power of The One Ring. Recounting his past meeting with Saruman to the Council of Elrond in the form of a flashback, Gandalf recalls Saruman's words:
Unlock with LitCharts A+'As the Power grows, its proved friends will also grow; and the Wise, such as you and I, may with patience come at last to direct its courses, to control it. We can bide our time, we can keep our thoughts in our hearts, deploring maybe evils done by the way, but approving the high and ultimate purpose: Knowledge, Rule, Order; all the things that we have so far striven in vain to accomplish, hindered rather than helped by our weak or idle friends. There need not be, there would not be, any real change in our designs, only in our means.'