what does george eliot mean by the following utterance, "since the time the child was sent to me and i have come to love her as myself,i have had light enough to trusten by"

The child is Silas's light in his life. The gold that was stolen was replaced with a greater treasure in the girl. Silas feels he has purpose and light in his life; he has the unconditional love and trust of this girl. Silas is no longer an isolated hermit angry at the world.