Hrmm that's a tough one but I would do Any knowledge can be learned if you read more, write more, think more, and ask more often enough. I would use acquired instead of learned and inquire instead of ask though. Learned just doesn't seem to work and generally with knowledge English uses acquired. Personally inquire sounds better than ask to me but ask sounds okay. I do wish someone else would examine my sentence though as something is bothering me about it.