Why does a Satguru assign an entirely new work to His disciple, which disciple has never thought of doing?

Shri Bharath Krishna asked: Pādanamaskāram Swamiji, Thank you so much for teaching me both theoretically and practically. I am the most undisciplined soul. Finally I am able to learn some discipline due to Your knowledge and Your continued guidance both in my spiritual and worldly progress. I have one question for which I request You to kindly answer. My question is as follows:

Why a Satguru does always assigns an entirely new work to His / Her disciples which they have never thought of doing?

Detailed question: Earlier I was learning Spiritual Knowledge from Amma and I was closely observing Her activities and Her interactions with Her disciples whenever possible. After discussing with many of her disciples I learned that Amma always assigned some works to her devotees which they have never thought of doing and they even didn't believe that they have such skill. However since it is Amma who is asking them, they have anyway decided to do their best and over time they have excelled in it. Just when they got a good grip of what they are doing, Amma again assigned some entirely different work!

I have noticed that Shri Satya Sai Baba also did the same to His personal photographer. That devotee didn't even know how to handle a Camera properly when Sai Baba asked Him to be His personal photographer. Such a boon He got that He get to observe Swami so closely. By your grace, He too has excelled in that work.

Now whatever works that are available to be done in order to contribute from my side to propagate your knowledge are the kind of works which I have never thought of doing. But in order to please You, I have to do those works only. I have to serve You the way You want me to, but not the way I like to. So, with your blessings, I am trying.

Now my question is, is there any particular reason why You always assign some new works to Your devotees which they never thought of doing?

Please forgive me if there is any mistake in my way of presenting the question Swamiji. Kindly answer my question. Your Defective Devotee and Servant, Bharath Krishna.]

Swami Replied:- When God asks the devotee to do some work, the devotee will be blessed with the talent by God Himself so that the devotee realises that God is doing the work through him/her and is giving credit to him/her and this will not give place to ego to enter the devotee. If the devotee has already that talent, the devotee thinks that he/she has served God through his/her inherent talent and this will give place to ego to enter the devotee. Ego and jealousy towards God or co-devotees shall be always avoided especially in the case of a circle of contemporary human incarnation of God and devotees. These two are the simultaneous cataracts of the two eyes that mask the true Spiritual knowledge resulting in total blindness-ignorance that leads to the downfall of the devotee.