In offering the Sacrifice of Praise, one puts themselves into a triumphant position in Christ. Then it will be that nothing, neither the world nor circumstances nor flesh and blood will cause them to be separated from God, for Praise causes one to ascend and join themselves to the One Whom they praise.
One does not praise based on their feelings or circumstances for they do not praise on their own behalf in any way; they praise solely because God is worthy to be praised, thus they are able to praise God at all times regardless of any outside influences which serve only to diminish their faith. We may change, our environment may alter, our feelings may waver, but God never changes. He is still the God that is worthy to be praised.