The first is Frank Laubach (1884-1970). He is also called the "Apostles to the Illiterates". You can find a compilation of his letters to his father in "Letters by a Modern Mystic" which speaks of the passion he has for spending time with God.
"This year I have started out trying to live all my waking moments in conscious listening to the inner voice, asking without ceasing, 'What, Father, do you desire said? What, Father, do you desire done this minute?' It is clear that this is exactly what Jesus was doing all day every day. But it is not what His followers have been doing in very large numbers." - F. Laubach
The second is Sundar Singh (1889-1929). I read the amazing story of how Jesus met him and saved him, and the life of love that he lived. Here is the website.
