We must bear with those who are weak in understanding, provided they hold the foundation of faith and retain sound doctrine in Christ. For there is a great difference between those errors which overthrow the faith and those infirmities which do not destroy it. Therefore, those who are still weak are not to be rejected or treated harshly, but to be gently instructed, until they are strengthened in the knowledge of the truth. For Christ has not received us because we were strong, but to make us strong.
(John Calvin)

     We must never judge a brother in Christ harshly because he does not see all things as we see them. If he is weak in faith, he is still in Christ, and Christ has received him. The strong believer is not placed in the church to despise the weak, but to bear with him, to instruct him gently, and to remember that the Lord has been patient with us when we were ignorant and slow to learn. The Christian is not called to triumph over his brother in matters of doubtful disputation, but to seek his edification. If Christ has received him, then the strongest argument for receiving him also is already settled in heaven.
(Charles Spurgeon)

     Where love is rightly ordered in the church, it will restrain the harshness of judgment in matters of lesser importance. For the bond of unity among believers is not uniformity of opinion in all things, but the common participation in Christ. Therefore, disputes that arise in things indifferent must be governed not by pride or victory in argument, but by a sincere desire to preserve peace and edify the body.
(John Owen)