Quereshi said her word of encouragement would be just what her husband would have said before dying of stomach cancer last September.
Quereshi, who vowed to carry on her husband's apologetics ministry, appeared in a video that was played at a Christian conference in Bangalore, India.
The theme of the conference was no God but one, in honour of her husband's book entitled No God but One: Allah or Jesus?: A Former Muslim Investigates the Evidence for Islam and Christianity.
She told the audience there were three things her husband would have wanted to tell Christian converts at the meeting.
She said the first piece of advice would be "soak in Jesus' presence and soak in his word" as she added that Nabeel believed Christians of Muslim backgrounds (CMB's) going into ministry should have "an average of two years of discipleship and growth before pursuing ministry".
"He said he learned this lesson the hard way coming too quickly into ministry while lacked grace and wisdom,"Quereshi said.
"It was God's protection that helped him steer clear of significant pitfalls."
Her second point of encouragement pinpointed the importance of getting rid of Muslim tendencies.
She added: "One of the first questions Nabeel would ask of a CMB is, 'Have you informed your family?' This was one of the first questions Nabeel would ask because he did not want others to go through what he did, regretting that he did not tell his parents about his conversion, that they found out by other means."
Lastly, she urged the audience to move on in their Christian faith "without shame" reminding people that God's goodness is always there despite challenging situations.
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