Begin to fulfill the commandments relating to small things, and you will come to fulfill the commandments relating to great things; everywhere small things lead to great things. Begin by fulfilling the commandment of fasting on Wednesdays and Fridays, or the tenth commandment relating to evil thought and desires, and you will eventually learn to fulfill all the commandments. He that is faithful in that which is least is faithful also in much.
– St. John of Kronstadt
From the book My Life in Christ