So I guess Patur Aval Assur’s question could be asked about my example of children sharing in this manner:
If both lead to sharing at the end, why is the wise child who does it because it is his purpose any better than the child who does it because his mommy will praise him?
I can think of two possible answers:
1. Reaching the point where we are doing things because it’s our purpose is itself part of our purpose. So even if we’re doing things that we are purposed to do but we have different reasons for doing so, we’re not 100% fulfilling our purpose.
2. Chazal were concerned that fulfilling our purpose for any other reason presented a risk of being led astray. It allows for our yetzer haras to begin rationalizing away at our reasons. Therefore, the reason for ???? ???? ???? ???? ??? is one of safety.