that Oswald knows

from My Utmost for His Highest, Feb 19
Drudgery is one of the finest tests to determine the genuineness of our character. Drudgery is work that is far removed from anything we think of as ideal work. It is the utterly hard, menial, tiresome, and dirty work. And when we experience it, our spirituality is instantly tested and we will know whether or not we are spiritually genuine.

John 13
“Do you understand what I have done for you?” he asked them. ¹³ “You call me ‘Teacher’ and ‘Lord,’ and rightly so, for that is what I am. ¹⁴ Now that I, your Lord and Teacher, have washed your feet, you also should wash one another’s feet. ¹⁵ I have set you an example that you should do as I have done for you. ¹⁶ Very truly I tell you, no servant is greater than his master, nor is a messenger greater than the one who sent him. ¹⁷ Now that you know these things, you will be blessed if you do them.