Everything we do in the ways of God, we must do it with firmness and rectitude, being firm and keeping our forehead high in the face of any difficulty or problem that arises.
But, the strength comes from God, because every time we are going through struggles in life and weaknesses come that deplete us, God helps us and keeps us standing.
So we must trust the Lord with all our hearts, the Lord will never leave us on the ground. God will always accompany us in every problem that comes, we believe in Him because He is God and always keeps what He promises.
But the God of all grace, who hath called us unto his eternal glory by Christ Jesus, after that ye have suffered a while, make you perfect, stablish, strengthen, settle you.
1 Peter 5:10