Psalm 66:9, "who preserves our life among the living, and doesn’t allow our feet to be moved," is a powerful statement about God's sustaining power and protection. Let's break down what it means:

"Who preserves our life among the living..." This speaks to God's role as the giver and sustainer of life. It acknowledges that our very existence is dependent on God. He keeps us alive, day by day. This isn't just about physical survival; it can also encompass spiritual vitality. He keeps us truly alive, full of purpose and hope.

"...and doesn’t allow our feet to be moved." This is a metaphor for stability and security. "Feet being moved" can refer to:

Physical security: God protects us from physical danger, hardship, and instability. He helps us to stand firm even when facing challenges.
Spiritual stability: God prevents us from stumbling in our faith or being led astray by temptation. He keeps us grounded in His truth.
Emotional resilience: God provides the strength to withstand emotional turmoil and maintain a stable emotional state. He helps us from being overwhelmed by life's difficulties.
Social standing/position: In a wider sense, it could be God helps us maintain our position or status, not allowing us to be overthrown by our enemies or by circumstances.

In essence, the verse conveys the following key ideas:

Dependence on God: Our lives are a gift from God, and He is responsible for keeping us alive.
Divine Protection: God actively safeguards us from dangers and helps us to stand firm.
Stability and Security: God grants us stability in various aspects of our lives, both physical and spiritual, so we are not easily shaken or defeated.
Gratitude: It's an expression of thankfulness for God's continuous care and protection.

The verse is a reminder to trust in God's provision and protection, acknowledging that He is the source of our life and the one who keeps us from falling. It's a call to rely on Him for strength, stability, and perseverance in the face of life's challenges.