If you are spiritually strong then you should fully expect to bear with the weakness of others. True love isn't mutual, true love is selfless. Knowledge is proven to be understanding when it is practiced/implemented. The strong are instructed not to cause the weak to stumble. The weak will 'grind' at my knowledge (bear with them) but as is clarified in 1 Cor. 13, even if I have all knowledge, if I don't have love I am nothing.