He was born on the farm Palmietfontein in the Potchefstroom district as son of Willem Jacobus Janse van Rensburg and Anna Catharina Janse van Rensburg. He only received 20 days of formal school training at the Rooipoort farm school, and spent much of his youth as a cattle herder. He could never write, but assisted by his mother learnt to read from the Bible. He never read anything else.