who can bear gently with the ignorant and erring, for that he himself also is compassed with infirmity;

He is able to deal gently with those who are ignorant and misguided, since he himself is beset by weakness.

able to be gentle to those ignorant and going astray, since himself also is compassed with infirmity;

being able to exercise forbearance towards the ignorant and erring, since he himself also is clothed with infirmity;