USoga ekuthiwa waguqukela ngokugqibeleleyo kwinkolo yobuKrestu eseyinkwenkwana ngenxa yamava okholo awawafumana kwisikolo secawa, waye waphehlelelwa eScotland ngonyaka we-1848.Wabuyela kwiphondo leMpuma Koloni, ukusukela ngonyaka we-1849 wasebenza njengotitshala ngenkolo yobuKrisru nomvangeli phambi kokuba abuyele eScotland ayokufunda izifundo zobuThixo. USoga wathweswa isidanga kwizifundo zobuThixo kwiYunivesithi iGlascow enama-27 eminyaka, wabekwa njengomfundisi webandla i-United Presbyterian Church ngonyaka we-1856, umAfrika wokuqala ukuphumelela oku.