The Bible teaches us that the Holy Spirit is a Spirit of knowledge and the fear of the Lord (Isa.11:2-3). The mark of a Spirit-filled person is that he/she will be only find delight in the fear of the Lord (Isa.11:3). When the fear of God is not a terror but a joy, then that fear is from the Spirit of God. The fear of God is not a sign of weakness but of power in the Spirit; for, a man who fears God and not man, relies in God and not in self or situation. Thus, fear of God makes room for the power of faith (1Cor.2:3,4).
However, He is not the spirit of timidity (2Tim.1:7), but the Spirit of courage, boldness, and power (Acts 4:31).
Also, He is not the spirit of bondage that leads to fear, but the Spirit of adoption that helps us draw near to the Father as sons and not as slaves (Rom.8:15,16).