One of the major themes in the Bible is to fear the Lord. At first glance this could be taken to mean that we are to fear God and be afraid of him. But, the truth is that love casts away all fear and we have no need to be afraid of God. Indeed we are called to come to him with boldness and make our requests known to him.
The way we are to fear God is to hate what it is he hates. Fearing God means we live a lifestyle which reflects his ways for us. And if we live a lifestyle pleasing to him, not calling evil good, then our lifestyle and attitudes of life will show that we do indeed fear God.
Pro 8:13 The fear of the LORD is to hate evil. Pride, arrogance, an evil lifestyle, and perverted speech I despise.