Joy and trust in God are deeply connected, representing the profound bond between a person and the Creator. This joy is specifically meant for those who fear God [אבן עזרא], outlining a spiritual journey where faith ultimately leads to redemption and wholeness.
The primary approach among commentators is that this joy awakens following salvation. It is the gladness that fills a person when God provides rescue from harm. This feeling comes from the clear understanding that the deliverance came directly from Him, which is the natural result of trusting in His holy name. It is simply God's way to save those who place their trust in Him [רד״ק, מצודת דוד, ביאור שטיינזלץ].
However, rather than viewing joy solely as a reaction to being saved, another perspective emphasizes that joy exists even during the waiting period. Hoping in God is fundamentally different from expecting help from another person. Someone waiting for human assistance might feel sadness if the help is delayed, worrying that their friend either cannot or will not help. In contrast, trust in God is so powerful that the heart finds joy even if the desired outcome is not immediate. The absolute confidence that God will provide salvation stems from the fact that His holy name is associated with us [מלבי״ם]. When a person reaches this deep and complete level of faith, joy encompasses their entire being. It reaches a point where even the physical, material heart actively participates, genuinely rejoicing in God out of immense faith [אלשיך].