A profound sense of closeness between a person and God naturally arises from the realization that prayers are truly heard. This awareness creates a lasting commitment to continually turn to Him. God pays careful attention to the voice of prayer [מאירי]. In fact, His closeness is so great that He leans in to listen even before a person has uttered a single sound [אלשיך].
Because of this divine attention, a person is inspired to call out to God constantly. The primary approach among commentators is that this commitment spans an individual's entire lifetime. Rather than reaching out only once, a person resolves to turn to God at every possible moment [אבן עזרא, מאירי]. This constant communication reflects an absolute dependence on Him, serving as a promise to never seek help from any other source [רד״ק]. It also expresses a deep confidence that on any day a prayer is offered, God will indeed be there to listen [מצודת דוד].
Alternatively, this commitment can be understood as referring to specific, highly emotional periods in life. A person naturally cries out for help during difficult times of distress [רש״י, ביאור שטיינזלץ], but they also call out during days of redemption to offer praise [רש״י]. Another perspective suggests that turning to God refers specifically to the prime of one's life. Instead of waiting until the approach of death to repent and seek God, a person reaches out while still active and full of strength. Praying during the peak of life, when energy and capability are at their highest, makes the prayer especially favorable and deeply welcomed by God [אלשיך].