When he writes, The human understanding when it has once adopted an opinion ... draws all things else to support and agree with it", Bacon is anticipating what well known psychological tendency?"

Confirmation Bias

Explanation:

Confirmation bias is a deep seated tendency to prefer information that confirms our existing positions. The human understanding when it has once adopted an opinion draws all things else to support and agree with it. And though there is a greater number and weight of instances to be found not true, he either neglects, despises or rejects in order that by this great and pernicious determination the authority of its conclusions may remain inviolate. Confirmation bias is found to be important because it may lead people to hold strongly to false beliefs or give more weight to information that supports their beliefs than is warranted by evidences. This biased approach is largely unintentional and often results in ignoring inconsistent information

This is a well known psychological tendency