Rabbenu Bachya explains that it is not spelled out to us which profession is a better one or one that will be more successful. This idea applies to anything we set out to do in "secular affairs" be it a trip, construction, a job. We have no idea whether it will be successful or harmful. "It therefore follows that , both in making a choice and implementing it, we must trust in GD that He will help us attain what is for our good. We must apply ourselves diligently to our work and beseech Him to stir our hearts to choose what is good and proper for us.
pg 429/431
pg 429/431
