From the book:
“If you really desire to be victorious in this unseen warfare and be rewarded with a crown, you must plant in your heart the following four dispositions and spiritual activities, as it were arming yourself with invisible weapons, the most trustworthy and unconquerable of all, namely:
a) never rely on yourself in anything;
b) bear always in your heart a perfect and all-daring trust in God alone;
c) strive without ceasing;
and d) remain constantly in prayer.”
That painting at the top is another by Viktor Vasnetsov. Take a look at her face. That’s either indigestion or unseen spiritual warfare.